| 1 | # This program is public domain |
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| 2 | # Author: Paul Kienzle |
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| 3 | """ |
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| 4 | Format values and uncertainties nicely for printing. |
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| 5 | |
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| 6 | :func:`format_uncertainty_pm`(v,err) produces the expanded format v +/- err. |
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| 7 | |
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| 8 | :func:`format_uncertainty_compact`(v,err) produces the compact format v(##), |
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| 9 | where the number in parenthesis is the uncertainty in the last two digits of v. |
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| 10 | |
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| 11 | :func:`format_uncertainty`(v,err) uses the compact format by default, but this |
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| 12 | can be changed to use the expanded +/- format by setting |
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| 13 | format_uncertainty.compact to False. |
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| 14 | |
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| 15 | The formatted string uses only the number of digits warranted by |
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| 16 | the uncertainty in the measurement. |
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| 17 | |
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| 18 | If the uncertainty is 0 or not otherwise provided, the simple |
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| 19 | %g floating point format option is used. |
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| 20 | |
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| 21 | Infinite and indefinite numbers are represented as inf and NaN. |
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| 22 | |
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| 23 | Example:: |
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| 24 | |
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| 25 | >>> v,dv = 757.2356,0.01032 |
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| 26 | >>> print format_uncertainty_pm(v,dv) |
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| 27 | 757.236 +/- 0.010 |
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| 28 | >>> print format_uncertainty_compact(v,dv) |
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| 29 | 757.236(10) |
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| 30 | >>> print format_uncertainty(v,dv) |
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| 31 | 757.236(10) |
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| 32 | >>> format_uncertainty.compact = False |
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| 33 | >>> print format_uncertainty(v,dv) |
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| 34 | 757.236 +/- 0.010 |
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| 35 | |
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| 36 | UncertaintyFormatter() returns a private formatter with its own |
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| 37 | formatter.compact flag. |
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| 38 | """ |
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| 39 | from __future__ import division |
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| 40 | |
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| 41 | import math |
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| 42 | import numpy |
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| 43 | __all__ = ['format_uncertainty', 'format_uncertainty_pm', |
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| 44 | 'format_uncertainty_compact'] |
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| 45 | |
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| 46 | # Coordinating scales across a set of numbers is not supported. For easy |
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| 47 | # comparison a set of numbers should be shown in the same scale. One could |
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| 48 | # force this from the outside by adding scale parameter (either 10**n, n, or |
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| 49 | # a string representing the desired SI prefix) and having a separate routine |
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| 50 | # which computes the scale given a set of values. |
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| 51 | |
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| 52 | # Coordinating scales with units offers its own problems. Again, the user |
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| 53 | # may want to force particular units. This can be done by outside of the |
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| 54 | # formatting routines by scaling the numbers to the appropriate units then |
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| 55 | # forcing them to print with scale 10**0. If this is a common operation, |
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| 56 | # however, it may want to happen inside. |
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| 57 | |
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| 58 | # The value e<n> is currently formatted into the number. Alternatively this |
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| 59 | # scale factor could be returned so that the user can choose the appropriate |
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| 60 | # SI prefix when printing the units. This gets tricky when talking about |
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| 61 | # composite units such as 2.3e-3 m**2 -> 2300 mm**2, and with volumes |
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| 62 | # such as 1 g/cm**3 -> 1 kg/L. |
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| 63 | |
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| 64 | |
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| 65 | def format_uncertainty_pm(value, uncertainty): |
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| 66 | """ |
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| 67 | Given *value* v and *uncertainty* dv, return a string v +/- dv. |
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| 68 | """ |
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| 69 | return _format_uncertainty(value, uncertainty, compact=False) |
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| 70 | |
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| 71 | |
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| 72 | def format_uncertainty_compact(value, uncertainty): |
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| 73 | """ |
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| 74 | Given *value* v and *uncertainty* dv, return the compact |
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| 75 | representation v(##), where ## are the first two digits of |
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| 76 | the uncertainty. |
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| 77 | """ |
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| 78 | return _format_uncertainty(value, uncertainty, compact=True) |
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| 79 | |
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| 80 | |
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| 81 | class UncertaintyFormatter: |
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| 82 | """ |
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| 83 | Value and uncertainty formatter. |
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| 84 | |
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| 85 | The *formatter* instance will use either the expanded v +/- dv form |
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| 86 | or the compact v(##) form depending on whether *formatter.compact* is |
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| 87 | True or False. The default is True. |
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| 88 | """ |
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| 89 | compact = True |
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| 90 | |
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| 91 | def __call__(self, value, uncertainty): |
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| 92 | """ |
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| 93 | Given *value* and *uncertainty*, return a string representation. |
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| 94 | """ |
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| 95 | return _format_uncertainty(value, uncertainty, self.compact) |
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| 96 | format_uncertainty = UncertaintyFormatter() |
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| 97 | |
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| 98 | |
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| 99 | def _format_uncertainty(value, uncertainty, compact): |
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| 100 | """ |
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| 101 | Implementation of both the compact and the +/- formats. |
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| 102 | """ |
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| 103 | # Handle indefinite value |
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| 104 | if numpy.isinf(value): |
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| 105 | return "inf" if value > 0 else "-inf" |
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| 106 | if numpy.isnan(value): |
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| 107 | return "NaN" |
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| 108 | |
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| 109 | # Handle indefinite uncertainty |
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| 110 | if uncertainty is None or uncertainty <= 0 or numpy.isnan(uncertainty): |
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| 111 | return "%g" % value |
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| 112 | if numpy.isinf(uncertainty): |
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| 113 | if compact: |
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| 114 | return "%.2g(inf)" % value |
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| 115 | else: |
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| 116 | return "%.2g +/- inf" % value |
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| 117 | |
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| 118 | # Handle zero and negative values |
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| 119 | sign = "-" if value < 0 else "" |
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| 120 | value = abs(value) |
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| 121 | |
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| 122 | # Determine scale of value and error |
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| 123 | err_place = int(math.floor(math.log10(uncertainty))) |
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| 124 | if value == 0: |
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| 125 | val_place = err_place - 1 |
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| 126 | else: |
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| 127 | val_place = int(math.floor(math.log10(value))) |
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| 128 | |
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| 129 | if err_place > val_place: |
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| 130 | # Degenerate case: error bigger than value |
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| 131 | # The mantissa is 0.#(##)e#, 0.0#(##)e# or 0.00#(##)e# |
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| 132 | val_place = err_place + 2 |
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| 133 | elif err_place == val_place: |
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| 134 | # Degenerate case: error and value the same order of magnitude |
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| 135 | # The value is ##(##)e#, #.#(##)e# or 0.##(##)e# |
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| 136 | val_place = err_place + 1 |
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| 137 | elif err_place <= 1 and val_place >= -3: |
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| 138 | # Normal case: nice numbers and errors |
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| 139 | # The value is ###.###(##) |
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| 140 | val_place = 0 |
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| 141 | else: |
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| 142 | # Extreme cases: zeros before value or after error |
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| 143 | # The value is ###.###(##)e#, ##.####(##)e# or #.#####(##)e# |
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| 144 | pass |
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| 145 | |
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| 146 | # Force engineering notation, with exponent a multiple of 3 |
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| 147 | val_place = int(math.floor(val_place / 3.)) * 3 |
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| 148 | |
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| 149 | # Format the result |
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| 150 | digits_after_decimal = abs(val_place - err_place + 1) |
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| 151 | val_str = "%.*f" % (digits_after_decimal, value / 10.**val_place) |
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| 152 | exp_str = "e%d" % val_place if val_place != 0 else "" |
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| 153 | if compact: |
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| 154 | err_str = "(%2d)" % int(uncertainty / 10.**(err_place - 1) + 0.5) |
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| 155 | result = "".join((sign, val_str, err_str, exp_str)) |
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| 156 | else: |
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| 157 | err_str = "%.*f" % (digits_after_decimal, uncertainty / 10.**val_place) |
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| 158 | result = "".join((sign, val_str, exp_str + " +/- ", err_str, exp_str)) |
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| 159 | return result |
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| 160 | |
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| 161 | |
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| 162 | def test_compact(): |
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| 163 | # Oops... renamed function after writing tests |
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| 164 | value_str = format_uncertainty_compact |
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| 165 | |
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| 166 | # val_place > err_place |
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| 167 | assert value_str(1235670,766000) == "1.24(77)e6" |
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| 168 | assert value_str(123567.,76600) == "124(77)e3" |
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| 169 | assert value_str(12356.7,7660) == "12.4(77)e3" |
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| 170 | assert value_str(1235.67,766) == "1.24(77)e3" |
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| 171 | assert value_str(123.567,76.6) == "124(77)" |
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| 172 | assert value_str(12.3567,7.66) == "12.4(77)" |
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| 173 | assert value_str(1.23567,.766) == "1.24(77)" |
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| 174 | assert value_str(.123567,.0766) == "0.124(77)" |
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| 175 | assert value_str(.0123567,.00766) == "0.0124(77)" |
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| 176 | assert value_str(.00123567,.000766) == "0.00124(77)" |
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| 177 | assert value_str(.000123567,.0000766) == "124(77)e-6" |
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| 178 | assert value_str(.0000123567,.00000766) == "12.4(77)e-6" |
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| 179 | assert value_str(.00000123567,.000000766) == "1.24(77)e-6" |
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| 180 | assert value_str(.000000123567,.0000000766) == "124(77)e-9" |
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| 181 | assert value_str(.00000123567,.0000000766) == "1.236(77)e-6" |
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| 182 | assert value_str(.0000123567,.0000000766) == "12.357(77)e-6" |
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| 183 | assert value_str(.000123567,.0000000766) == "123.567(77)e-6" |
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| 184 | assert value_str(.00123567,.000000766) == "0.00123567(77)" |
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| 185 | assert value_str(.0123567,.00000766) == "0.0123567(77)" |
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| 186 | assert value_str(.123567,.0000766) == "0.123567(77)" |
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| 187 | assert value_str(1.23567,.000766) == "1.23567(77)" |
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| 188 | assert value_str(12.3567,.00766) == "12.3567(77)" |
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| 189 | assert value_str(123.567,.0764) == "123.567(76)" |
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| 190 | assert value_str(1235.67,.764) == "1235.67(76)" |
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| 191 | assert value_str(12356.7,7.64) == "12356.7(76)" |
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| 192 | assert value_str(123567,76.4) == "123567(76)" |
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| 193 | assert value_str(1235670,764) == "1.23567(76)e6" |
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| 194 | assert value_str(12356700,764) == "12.35670(76)e6" |
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| 195 | assert value_str(123567000,764) == "123.56700(76)e6" |
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| 196 | assert value_str(123567000,7640) == "123.5670(76)e6" |
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| 197 | assert value_str(1235670000,76400) == "1.235670(76)e9" |
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| 198 | |
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| 199 | # val_place == err_place |
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| 200 | assert value_str(123567,764000) == "0.12(76)e6" |
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| 201 | assert value_str(12356.7,76400) == "12(76)e3" |
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| 202 | assert value_str(1235.67,7640) == "1.2(76)e3" |
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| 203 | assert value_str(123.567,764) == "0.12(76)e3" |
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| 204 | assert value_str(12.3567,76.4) == "12(76)" |
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| 205 | assert value_str(1.23567,7.64) == "1.2(76)" |
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| 206 | assert value_str(.123567,.764) == "0.12(76)" |
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| 207 | assert value_str(.0123567,.0764) == "12(76)e-3" |
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| 208 | assert value_str(.00123567,.00764) == "1.2(76)e-3" |
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| 209 | assert value_str(.000123567,.000764) == "0.12(76)e-3" |
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| 210 | |
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| 211 | # val_place == err_place-1 |
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| 212 | assert value_str(123567,7640000) == "0.1(76)e6" |
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| 213 | assert value_str(12356.7,764000) == "0.01(76)e6" |
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| 214 | assert value_str(1235.67,76400) == "0.001(76)e6" |
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| 215 | assert value_str(123.567,7640) == "0.1(76)e3" |
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| 216 | assert value_str(12.3567,764) == "0.01(76)e3" |
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| 217 | assert value_str(1.23567,76.4) == "0.001(76)e3" |
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| 218 | assert value_str(.123567,7.64) == "0.1(76)" |
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| 219 | assert value_str(.0123567,.764) == "0.01(76)" |
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| 220 | assert value_str(.00123567,.0764) == "0.001(76)" |
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| 221 | assert value_str(.000123567,.00764) == "0.1(76)e-3" |
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| 222 | |
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| 223 | # val_place == err_place-2 |
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| 224 | assert value_str(12356700,7640000000) == "0.0(76)e9" |
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| 225 | assert value_str(1235670,764000000) == "0.00(76)e9" |
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| 226 | assert value_str(123567,76400000) == "0.000(76)e9" |
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| 227 | assert value_str(12356,7640000) == "0.0(76)e6" |
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| 228 | assert value_str(1235,764000) == "0.00(76)e6" |
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| 229 | assert value_str(123,76400) == "0.000(76)e6" |
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| 230 | assert value_str(12,7640) == "0.0(76)e3" |
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| 231 | assert value_str(1,764) == "0.00(76)e3" |
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| 232 | assert value_str(0.1,76.4) == "0.000(76)e3" |
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| 233 | assert value_str(0.01,7.64) == "0.0(76)" |
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| 234 | assert value_str(0.001,0.764) == "0.00(76)" |
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| 235 | assert value_str(0.0001,0.0764) == "0.000(76)" |
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| 236 | assert value_str(0.00001,0.00764) == "0.0(76)e-3" |
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| 237 | |
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| 238 | # val_place == err_place-3 |
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| 239 | assert value_str(12356700,76400000000) == "0.000(76)e12" |
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| 240 | assert value_str(1235670,7640000000) == "0.0(76)e9" |
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| 241 | assert value_str(123567,764000000) == "0.00(76)e9" |
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| 242 | assert value_str(12356,76400000) == "0.000(76)e9" |
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| 243 | assert value_str(1235,7640000) == "0.0(76)e6" |
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| 244 | assert value_str(123,764000) == "0.00(76)e6" |
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| 245 | assert value_str(12,76400) == "0.000(76)e6" |
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| 246 | assert value_str(1,7640) == "0.0(76)e3" |
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| 247 | assert value_str(0.1,764) == "0.00(76)e3" |
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| 248 | assert value_str(0.01,76.4) == "0.000(76)e3" |
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| 249 | assert value_str(0.001,7.64) == "0.0(76)" |
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| 250 | assert value_str(0.0001,0.764) == "0.00(76)" |
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| 251 | assert value_str(0.00001,0.0764) == "0.000(76)" |
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| 252 | assert value_str(0.000001,0.00764) == "0.0(76)e-3" |
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| 253 | |
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| 254 | # Zero values |
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| 255 | assert value_str(0,7640000) == "0.0(76)e6" |
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| 256 | assert value_str(0, 764000) == "0.00(76)e6" |
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| 257 | assert value_str(0, 76400) == "0.000(76)e6" |
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| 258 | assert value_str(0, 7640) == "0.0(76)e3" |
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| 259 | assert value_str(0, 764) == "0.00(76)e3" |
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| 260 | assert value_str(0, 76.4) == "0.000(76)e3" |
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| 261 | assert value_str(0, 7.64) == "0.0(76)" |
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| 262 | assert value_str(0, 0.764) == "0.00(76)" |
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| 263 | assert value_str(0, 0.0764) == "0.000(76)" |
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| 264 | assert value_str(0, 0.00764) == "0.0(76)e-3" |
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| 265 | assert value_str(0, 0.000764) == "0.00(76)e-3" |
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| 266 | assert value_str(0, 0.0000764) == "0.000(76)e-3" |
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| 267 | |
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| 268 | # negative values |
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| 269 | assert value_str(-1235670,765000) == "-1.24(77)e6" |
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| 270 | assert value_str(-1.23567,.766) == "-1.24(77)" |
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| 271 | assert value_str(-.00000123567,.0000000766) == "-1.236(77)e-6" |
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| 272 | assert value_str(-12356.7,7.64) == "-12356.7(76)" |
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| 273 | assert value_str(-123.567,764) == "-0.12(76)e3" |
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| 274 | assert value_str(-1235.67,76400) == "-0.001(76)e6" |
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| 275 | assert value_str(-.000123567,.00764) == "-0.1(76)e-3" |
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| 276 | assert value_str(-12356,7640000) == "-0.0(76)e6" |
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| 277 | assert value_str(-12,76400) == "-0.000(76)e6" |
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| 278 | assert value_str(-0.0001,0.764) == "-0.00(76)" |
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| 279 | |
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| 280 | # non-finite values |
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| 281 | assert value_str(-numpy.inf,None) == "-inf" |
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| 282 | assert value_str(numpy.inf,None) == "inf" |
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| 283 | assert value_str(numpy.NaN,None) == "NaN" |
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| 284 | |
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| 285 | # bad or missing uncertainty |
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| 286 | assert value_str(-1.23567,numpy.NaN) == "-1.23567" |
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| 287 | assert value_str(-1.23567,-numpy.inf) == "-1.23567" |
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| 288 | assert value_str(-1.23567,-0.1) == "-1.23567" |
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| 289 | assert value_str(-1.23567,0) == "-1.23567" |
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| 290 | assert value_str(-1.23567,None) == "-1.23567" |
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| 291 | assert value_str(-1.23567,numpy.inf) == "-1.2(inf)" |
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| 292 | |
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| 293 | def test_pm(): |
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| 294 | # Oops... renamed function after writing tests |
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| 295 | value_str = format_uncertainty_pm |
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| 296 | |
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| 297 | # val_place > err_place |
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| 298 | assert value_str(1235670,766000) == "1.24e6 +/- 0.77e6" |
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| 299 | assert value_str(123567., 76600) == "124e3 +/- 77e3" |
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| 300 | assert value_str(12356.7, 7660) == "12.4e3 +/- 7.7e3" |
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| 301 | assert value_str(1235.67, 766) == "1.24e3 +/- 0.77e3" |
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| 302 | assert value_str(123.567, 76.6) == "124 +/- 77" |
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| 303 | assert value_str(12.3567, 7.66) == "12.4 +/- 7.7" |
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| 304 | assert value_str(1.23567, .766) == "1.24 +/- 0.77" |
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| 305 | assert value_str(.123567, .0766) == "0.124 +/- 0.077" |
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| 306 | assert value_str(.0123567, .00766) == "0.0124 +/- 0.0077" |
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| 307 | assert value_str(.00123567, .000766) == "0.00124 +/- 0.00077" |
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| 308 | assert value_str(.000123567, .0000766) == "124e-6 +/- 77e-6" |
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| 309 | assert value_str(.0000123567, .00000766) == "12.4e-6 +/- 7.7e-6" |
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| 310 | assert value_str(.00000123567, .000000766) == "1.24e-6 +/- 0.77e-6" |
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| 311 | assert value_str(.000000123567,.0000000766) == "124e-9 +/- 77e-9" |
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| 312 | assert value_str(.00000123567, .0000000766) == "1.236e-6 +/- 0.077e-6" |
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| 313 | assert value_str(.0000123567, .0000000766) == "12.357e-6 +/- 0.077e-6" |
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| 314 | assert value_str(.000123567, .0000000766) == "123.567e-6 +/- 0.077e-6" |
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| 315 | assert value_str(.00123567, .000000766) == "0.00123567 +/- 0.00000077" |
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| 316 | assert value_str(.0123567, .00000766) == "0.0123567 +/- 0.0000077" |
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| 317 | assert value_str(.123567, .0000766) == "0.123567 +/- 0.000077" |
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| 318 | assert value_str(1.23567, .000766) == "1.23567 +/- 0.00077" |
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| 319 | assert value_str(12.3567, .00766) == "12.3567 +/- 0.0077" |
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| 320 | assert value_str(123.567, .0764) == "123.567 +/- 0.076" |
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| 321 | assert value_str(1235.67, .764) == "1235.67 +/- 0.76" |
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| 322 | assert value_str(12356.7, 7.64) == "12356.7 +/- 7.6" |
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| 323 | assert value_str(123567, 76.4) == "123567 +/- 76" |
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| 324 | assert value_str(1235670, 764) == "1.23567e6 +/- 0.00076e6" |
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| 325 | assert value_str(12356700, 764) == "12.35670e6 +/- 0.00076e6" |
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| 326 | assert value_str(123567000, 764) == "123.56700e6 +/- 0.00076e6" |
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| 327 | assert value_str(123567000,7640) == "123.5670e6 +/- 0.0076e6" |
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| 328 | assert value_str(1235670000,76400) == "1.235670e9 +/- 0.000076e9" |
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| 329 | |
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| 330 | # val_place == err_place |
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| 331 | assert value_str(123567,764000) == "0.12e6 +/- 0.76e6" |
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| 332 | assert value_str(12356.7,76400) == "12e3 +/- 76e3" |
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| 333 | assert value_str(1235.67,7640) == "1.2e3 +/- 7.6e3" |
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| 334 | assert value_str(123.567,764) == "0.12e3 +/- 0.76e3" |
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| 335 | assert value_str(12.3567,76.4) == "12 +/- 76" |
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| 336 | assert value_str(1.23567,7.64) == "1.2 +/- 7.6" |
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| 337 | assert value_str(.123567,.764) == "0.12 +/- 0.76" |
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| 338 | assert value_str(.0123567,.0764) == "12e-3 +/- 76e-3" |
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| 339 | assert value_str(.00123567,.00764) == "1.2e-3 +/- 7.6e-3" |
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| 340 | assert value_str(.000123567,.000764) == "0.12e-3 +/- 0.76e-3" |
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| 341 | |
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| 342 | # val_place == err_place-1 |
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| 343 | assert value_str(123567,7640000) == "0.1e6 +/- 7.6e6" |
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| 344 | assert value_str(12356.7,764000) == "0.01e6 +/- 0.76e6" |
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| 345 | assert value_str(1235.67,76400) == "0.001e6 +/- 0.076e6" |
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| 346 | assert value_str(123.567,7640) == "0.1e3 +/- 7.6e3" |
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| 347 | assert value_str(12.3567,764) == "0.01e3 +/- 0.76e3" |
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| 348 | assert value_str(1.23567,76.4) == "0.001e3 +/- 0.076e3" |
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| 349 | assert value_str(.123567,7.64) == "0.1 +/- 7.6" |
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| 350 | assert value_str(.0123567,.764) == "0.01 +/- 0.76" |
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| 351 | assert value_str(.00123567,.0764) == "0.001 +/- 0.076" |
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| 352 | assert value_str(.000123567,.00764) == "0.1e-3 +/- 7.6e-3" |
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| 353 | |
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| 354 | # val_place == err_place-2 |
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| 355 | assert value_str(12356700,7640000000) == "0.0e9 +/- 7.6e9" |
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| 356 | assert value_str(1235670,764000000) == "0.00e9 +/- 0.76e9" |
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| 357 | assert value_str(123567,76400000) == "0.000e9 +/- 0.076e9" |
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| 358 | assert value_str(12356,7640000) == "0.0e6 +/- 7.6e6" |
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| 359 | assert value_str(1235,764000) == "0.00e6 +/- 0.76e6" |
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| 360 | assert value_str(123,76400) == "0.000e6 +/- 0.076e6" |
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| 361 | assert value_str(12,7640) == "0.0e3 +/- 7.6e3" |
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| 362 | assert value_str(1,764) == "0.00e3 +/- 0.76e3" |
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| 363 | assert value_str(0.1,76.4) == "0.000e3 +/- 0.076e3" |
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| 364 | assert value_str(0.01,7.64) == "0.0 +/- 7.6" |
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| 365 | assert value_str(0.001,0.764) == "0.00 +/- 0.76" |
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| 366 | assert value_str(0.0001,0.0764) == "0.000 +/- 0.076" |
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| 367 | assert value_str(0.00001,0.00764) == "0.0e-3 +/- 7.6e-3" |
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| 368 | |
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| 369 | # val_place == err_place-3 |
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| 370 | assert value_str(12356700,76400000000) == "0.000e12 +/- 0.076e12" |
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| 371 | assert value_str(1235670,7640000000) == "0.0e9 +/- 7.6e9" |
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| 372 | assert value_str(123567,764000000) == "0.00e9 +/- 0.76e9" |
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| 373 | assert value_str(12356,76400000) == "0.000e9 +/- 0.076e9" |
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| 374 | assert value_str(1235,7640000) == "0.0e6 +/- 7.6e6" |
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| 375 | assert value_str(123,764000) == "0.00e6 +/- 0.76e6" |
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| 376 | assert value_str(12,76400) == "0.000e6 +/- 0.076e6" |
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| 377 | assert value_str(1,7640) == "0.0e3 +/- 7.6e3" |
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| 378 | assert value_str(0.1,764) == "0.00e3 +/- 0.76e3" |
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| 379 | assert value_str(0.01,76.4) == "0.000e3 +/- 0.076e3" |
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| 380 | assert value_str(0.001,7.64) == "0.0 +/- 7.6" |
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| 381 | assert value_str(0.0001,0.764) == "0.00 +/- 0.76" |
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| 382 | assert value_str(0.00001,0.0764) == "0.000 +/- 0.076" |
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| 383 | assert value_str(0.000001,0.00764) == "0.0e-3 +/- 7.6e-3" |
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| 384 | |
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| 385 | # Zero values |
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| 386 | assert value_str(0,7640000) == "0.0e6 +/- 7.6e6" |
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| 387 | assert value_str(0, 764000) == "0.00e6 +/- 0.76e6" |
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| 388 | assert value_str(0, 76400) == "0.000e6 +/- 0.076e6" |
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| 389 | assert value_str(0, 7640) == "0.0e3 +/- 7.6e3" |
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| 390 | assert value_str(0, 764) == "0.00e3 +/- 0.76e3" |
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| 391 | assert value_str(0, 76.4) == "0.000e3 +/- 0.076e3" |
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| 392 | assert value_str(0, 7.64) == "0.0 +/- 7.6" |
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| 393 | assert value_str(0, 0.764) == "0.00 +/- 0.76" |
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| 394 | assert value_str(0, 0.0764) == "0.000 +/- 0.076" |
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| 395 | assert value_str(0, 0.00764) == "0.0e-3 +/- 7.6e-3" |
|---|
| 396 | assert value_str(0, 0.000764) == "0.00e-3 +/- 0.76e-3" |
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| 397 | assert value_str(0, 0.0000764) == "0.000e-3 +/- 0.076e-3" |
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| 398 | |
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| 399 | # negative values |
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| 400 | assert value_str(-1235670,766000) == "-1.24e6 +/- 0.77e6" |
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| 401 | assert value_str(-1.23567,.766) == "-1.24 +/- 0.77" |
|---|
| 402 | assert value_str(-.00000123567,.0000000766) == "-1.236e-6 +/- 0.077e-6" |
|---|
| 403 | assert value_str(-12356.7,7.64) == "-12356.7 +/- 7.6" |
|---|
| 404 | assert value_str(-123.567,764) == "-0.12e3 +/- 0.76e3" |
|---|
| 405 | assert value_str(-1235.67,76400) == "-0.001e6 +/- 0.076e6" |
|---|
| 406 | assert value_str(-.000123567,.00764) == "-0.1e-3 +/- 7.6e-3" |
|---|
| 407 | assert value_str(-12356,7640000) == "-0.0e6 +/- 7.6e6" |
|---|
| 408 | assert value_str(-12,76400) == "-0.000e6 +/- 0.076e6" |
|---|
| 409 | assert value_str(-0.0001,0.764) == "-0.00 +/- 0.76" |
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| 410 | |
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| 411 | # non-finite values |
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| 412 | assert value_str(-numpy.inf,None) == "-inf" |
|---|
| 413 | assert value_str(numpy.inf,None) == "inf" |
|---|
| 414 | assert value_str(numpy.NaN,None) == "NaN" |
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| 415 | |
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| 416 | # bad or missing uncertainty |
|---|
| 417 | assert value_str(-1.23567,numpy.NaN) == "-1.23567" |
|---|
| 418 | assert value_str(-1.23567,-numpy.inf) == "-1.23567" |
|---|
| 419 | assert value_str(-1.23567,-0.1) == "-1.23567" |
|---|
| 420 | assert value_str(-1.23567,0) == "-1.23567" |
|---|
| 421 | assert value_str(-1.23567,None) == "-1.23567" |
|---|
| 422 | assert value_str(-1.23567,numpy.inf) == "-1.2 +/- inf" |
|---|
| 423 | |
|---|
| 424 | def test_default(): |
|---|
| 425 | # Check that the default is the compact format |
|---|
| 426 | assert format_uncertainty(-1.23567,0.766) == "-1.24(77)" |
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| 427 | |
|---|
| 428 | def main(): |
|---|
| 429 | """ |
|---|
| 430 | Run all tests. |
|---|
| 431 | |
|---|
| 432 | This is equivalent to "nosetests --with-doctest" |
|---|
| 433 | """ |
|---|
| 434 | test_compact() |
|---|
| 435 | test_pm() |
|---|
| 436 | test_default() |
|---|
| 437 | |
|---|
| 438 | import doctest |
|---|
| 439 | doctest.testmod() |
|---|
| 440 | |
|---|
| 441 | if __name__ == "__main__": main() |
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