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Last change
on this file since 74b1770 was
79ac6f8,
checked in by Gervaise Alina <gervyh@…>, 15 years ago
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working on documentation
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File size:
1.4 KB
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1 | #!/usr/bin/env python |
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2 | """ |
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3 | Provide F(x)= P(|x|)*S(|x|) + bkd |
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4 | Fractal as a BaseComponent model |
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5 | """ |
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6 | |
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7 | from sans.models.FractalModel import FractalModel |
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8 | import math |
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9 | |
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10 | class FractalAbsModel(FractalModel): |
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11 | """ |
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12 | Class that evaluates a Fractal function. |
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13 | |
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14 | F(|x|)= P(|x|)*S(|x|) + bkd |
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15 | The model has Seven parameters: |
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16 | scale = Volume fraction |
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17 | radius = Block radius |
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18 | fractal_dim = Fractal dimension |
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19 | corr_length = correlation Length |
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20 | block_sld = SDL block |
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21 | solvent_sld = SDL solvent |
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22 | background = background |
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23 | |
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24 | """ |
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25 | def __init__(self): |
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26 | """Initialization """ |
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27 | # Initialize FractalModel |
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28 | |
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29 | FractalModel.__init__(self) |
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30 | ## Name of the model |
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31 | self.name = "Absolute Number Density Fractal" |
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32 | self.description=""" |
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33 | I(x)= P(|x|)*S(|x|) + bkd |
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34 | |
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35 | p(x)= scale* V^(2)*delta^(2)* F(x*radius)^(2) |
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36 | F(x) = 3*[sin(x)-x cos(x)]/x**3 |
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37 | |
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38 | The model has Seven parameters: |
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39 | scale = Volume fraction |
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40 | radius = Block radius |
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41 | fractal_dim = Fractal dimension |
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42 | corr_length = correlation Length |
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43 | block_sld = SDL block |
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44 | solvent_sld = SDL solvent |
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45 | background = background |
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46 | """ |
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47 | def _Fractal(self, x): |
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48 | """ |
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49 | """ |
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50 | return FractalModel._Fractal(self, math.fabs(x)) |
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51 | |
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52 | |
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