ascii_reader.py @ fe886ee

ESS_GUIESS_GUI_DocsESS_GUI_batch_fittingESS_GUI_bumps_abstractionESS_GUI_iss1116ESS_GUI_iss879ESS_GUI_iss959ESS_GUI_openclESS_GUI_orderingESS_GUI_sync_sascalccostrafo411magnetic_scattrelease-4.1.1release-4.1.2release-4.2.2release_4.0.1ticket-1009ticket-1094-headlessticket-1242-2d-resolutionticket-1243ticket-1249ticket885unittest-saveload

Last change on this file since fe886ee was 0e2aa40, checked in by Jae Cho <jhjcho@…>, 16 years ago
Made the letter of units in plots consistent for all
Property mode set to `100644`
File size: 8.1 KB

Line
1	"""
2	This software was developed by the University of Tennessee as part of the
3	Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
4	project funded by the US National Science Foundation.
5
6	See the license text in license.txt
7
8	copyright 2008, University of Tennessee
9	"""
10
11	import numpy
12	import os
13	from DataLoader.data_info import Data1D
14
15	# Check whether we have a converter available
16	has_converter = True
17	try:
18	from data_util.nxsunit import Converter
19	except:
20	has_converter = False
21
22	class Reader:
23	"""
24	Class to load ascii files (2 or 3 columns)
25	"""
26	## File type
27	type = ["ASCII files (.txt)\|.txt",
28	"ASCII files (.dat)\|.dat",
29	"ASCII files (.abs)\|.abs"]
30	## List of allowed extensions
31	ext=['.txt', '.TXT', '.dat', '.DAT', '.abs', '.ABS']
32
33	def read(self, path):
34	"""
35	Load data file
36
37	@param path: file path
38	@return: Data1D object, or None
39	@raise RuntimeError: when the file can't be opened
40	@raise ValueError: when the length of the data vectors are inconsistent
41	"""
42	if os.path.isfile(path):
43	basename = os.path.basename(path)
44	root, extension = os.path.splitext(basename)
45	if extension.lower() in self.ext:
46	try:
47	input_f = open(path,'r')
48	except :
49	raise RuntimeError, "ascii_reader: cannot open %s" % path
50	buff = input_f.read()
51	lines = buff.split('\n')
52
53	# some ascii data has \r line separator, try it when it has only one line
54	if len(lines) < 2 :
55	lines = buff.split('\r')
56
57	x = numpy.zeros(0)
58	y = numpy.zeros(0)
59	dy = numpy.zeros(0)
60	dx = numpy.zeros(0)
61
62	#temp. space to sort data
63	tx = numpy.zeros(0)
64	ty = numpy.zeros(0)
65	tdy = numpy.zeros(0)
66	tdx = numpy.zeros(0)
67
68	output = Data1D(x, y, dy=dy, dx=dx)
69	self.filename = output.filename = basename
70
71	data_conv_q = None
72	data_conv_i = None
73
74	if has_converter == True and output.x_unit != '1/A':
75	data_conv_q = Converter('1/A')
76	# Test it
77	data_conv_q(1.0, output.x_unit)
78
79	if has_converter == True and output.y_unit != '1/cm':
80	data_conv_i = Converter('1/cm')
81	# Test it
82	data_conv_i(1.0, output.y_unit)
83
84
85	# The first good line of data will define whether
86	# we have 2-column or 3-column ascii
87	has_error_dx = None
88	has_error_dy = None
89
90	for line in lines:
91	toks = line.split()
92	try:
93	_x = float(toks[0])
94	_y = float(toks[1])
95
96	if data_conv_q is not None:
97	_x = data_conv_q(_x, units=output.x_unit)
98
99	if data_conv_i is not None:
100	_y = data_conv_i(_y, units=output.y_unit)
101
102	# If we have an extra token, check
103	# whether it can be interpreted as a
104	# third column.
105	_dy = None
106	if len(toks)>2:
107	try:
108	_dy = float(toks[2])
109
110	if data_conv_i is not None:
111	_dy = data_conv_i(_dy, units=output.y_unit)
112
113	except:
114	# The third column is not a float, skip it.
115	pass
116
117	# If we haven't set the 3rd column
118	# flag, set it now.
119	if has_error_dy == None:
120	has_error_dy = False if _dy == None else True
121
122	#Check for dx
123	_dx = None
124	if len(toks)>3:
125	try:
126	_dx = float(toks[3])
127
128	if data_conv_i is not None:
129	_dx = data_conv_i(_dx, units=output.x_unit)
130
131	except:
132	# The 4th column is not a float, skip it.
133	pass
134
135	# If we haven't set the 3rd column
136	# flag, set it now.
137	if has_error_dx == None:
138	has_error_dx = False if _dx == None else True
139
140	x = numpy.append(x, _x)
141	y = numpy.append(y, _y)
142	if has_error_dy == True:
143	dy = numpy.append(dy, _dy)
144	if has_error_dx == True:
145	dx = numpy.append(dx, _dx)
146
147	#Same for temp.
148	tx = numpy.append(tx, _x)
149	ty = numpy.append(ty, _y)
150	if has_error_dy == True:
151	tdy = numpy.append(tdy, _dy)
152	if has_error_dx == True:
153	tdx = numpy.append(tdx, _dx)
154
155	except:
156	# Couldn't parse this line, skip it
157	pass
158
159
160	# Sanity check
161	if has_error_dy == True and not len(y) == len(dy):
162	raise RuntimeError, "ascii_reader: y and dy have different length"
163	if has_error_dx == True and not len(x) == len(dx):
164	raise RuntimeError, "ascii_reader: y and dy have different length"
165
166	# If the data length is zero, consider this as
167	# though we were not able to read the file.
168	if len(x)==0:
169	raise RuntimeError, "ascii_reader: could not load file"
170
171	#Let's re-order the data to make cal. curve look better some cases
172	ind = numpy.lexsort((ty,tx))
173	for i in ind:
174	x[i] = tx[ind[i]]
175	y[i] = ty[ind[i]]
176	if has_error_dy == True:
177	dy[i] = tdy[ind[i]]
178	if has_error_dx == True:
179	dx[i] = tdx[ind[i]]
180
181	output.x = x
182	output.y = y
183	output.dy = dy if has_error_dy == True else None
184	output.dx = dx if has_error_dx == True else None
185
186	if data_conv_q is not None:
187	output.xaxis("\\rm{Q}", output.x_unit)
188	else:
189	output.xaxis("\\rm{Q}", 'A^{-1}')
190	if data_conv_i is not None:
191	output.yaxis("\\rm{Intensity}", output.y_unit)
192	else:
193	output.yaxis("\\rm{Intensity}","cm^{-1}")
194
195	return output
196	else:
197	raise RuntimeError, "%s is not a file" % path
198	return None
199
200	if __name__ == "__main__":
201	reader = Reader()
202	#print reader.read("../test/test_3_columns.txt")
203	print reader.read("../test/empty.txt")
204
205
206

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source: sasview/DataLoader/readers/ascii_reader.py @ fe886ee

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