1 | |
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2 | from sas.models.BaseComponent import BaseComponent |
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3 | from sas.models.ReflModel import ReflModel |
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4 | from copy import deepcopy |
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5 | from math import floor |
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6 | from scipy.special import erf |
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7 | func_list = {'Erf':0, 'Linear':1} |
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8 | max_nshells = 10 |
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9 | |
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10 | class ReflectivityModel(BaseComponent): |
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11 | """ |
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12 | This multi-model is based on Parratt formalism and provides the capability |
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13 | of changing the number of layers between 0 and 10. |
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14 | """ |
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15 | def __init__(self, multfactor=1): |
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16 | """ |
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17 | :param multfactor: number of layers in the model, |
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18 | assumes 0<= n_shells <=10. |
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19 | """ |
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20 | BaseComponent.__init__(self) |
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21 | |
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22 | ## Setting model name model description |
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23 | self.description = "" |
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24 | model = ReflModel() |
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25 | self.model = model |
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26 | self.name = "ReflectivityModel" |
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27 | self.description = model.description |
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28 | self.n_layers = int(multfactor) |
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29 | ## Define parameters |
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30 | self.params = {} |
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31 | |
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32 | ## Parameter details [units, min, max] |
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33 | self.details = {} |
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34 | |
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35 | # non-fittable parameters |
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36 | self.non_fittable = model.non_fittable |
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37 | |
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38 | # list of function in order of the function number |
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39 | self.fun_list = self._get_func_list() |
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40 | ## dispersion |
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41 | self._set_dispersion() |
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42 | ## Define parameters |
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43 | self._set_params() |
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44 | |
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45 | ## Parameter details [units, min, max] |
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46 | self._set_details() |
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47 | |
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48 | #list of parameter that can be fitted |
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49 | self._set_fixed_params() |
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50 | self.model.params['n_layers'] = self.n_layers |
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51 | |
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52 | ## functional multiplicity info of the model |
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53 | # [int(maximum no. of functionality),"str(Titl), |
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54 | # [str(name of function0),...], [str(x-asix name of sld),...]] |
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55 | self.multiplicity_info = [max_nshells, "No. of Layers:", [], ['Depth']] |
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56 | ## independent parameter name and unit [string] |
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57 | self.input_name = "Q" |
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58 | self.input_unit = "A^{-1}" |
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59 | ## output name and unit [string] |
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60 | self.output_name = "Reflectivity" |
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61 | self.output_unit = "" |
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62 | |
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63 | def _clone(self, obj): |
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64 | """ |
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65 | Internal utility function to copy the internal |
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66 | data members to a fresh copy. |
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67 | """ |
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68 | obj.params = deepcopy(self.params) |
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69 | obj.non_fittable = deepcopy(self.non_fittable) |
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70 | obj.description = deepcopy(self.description) |
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71 | obj.details = deepcopy(self.details) |
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72 | obj.dispersion = deepcopy(self.dispersion) |
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73 | obj.model = self.model.clone() |
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74 | |
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75 | return obj |
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76 | |
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77 | |
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78 | def _set_dispersion(self): |
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79 | """ |
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80 | model dispersions |
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81 | """ |
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82 | ##set dispersion from model |
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83 | self.dispersion = {} |
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84 | |
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85 | |
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86 | def _set_params(self): |
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87 | """ |
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88 | Concatenate the parameters of the model to create |
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89 | this model parameters |
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90 | """ |
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91 | # rearrange the parameters for the given # of shells |
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92 | for name , value in self.model.params.iteritems(): |
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93 | n = 0 |
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94 | pos = len(name.split('_'))-1 |
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95 | if name.split('_')[0] == 'sldIM': |
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96 | continue |
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97 | elif name.split('_')[0] == 'func': |
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98 | n = -1 |
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99 | while n < self.n_layers: |
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100 | n += 1 |
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101 | if name.split('_')[pos] == 'inter%s' % str(n): |
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102 | self.params[name] = value |
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103 | continue |
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104 | #continue |
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105 | elif name.split('_')[pos][0:5] == 'inter': |
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106 | n = -1 |
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107 | while n < self.n_layers: |
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108 | n += 1 |
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109 | if name.split('_')[pos] == 'inter%s' % str(n): |
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110 | self.params[name] = value |
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111 | continue |
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112 | elif name.split('_')[pos][0:4] == 'flat': |
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113 | while n < self.n_layers: |
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114 | n += 1 |
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115 | if name.split('_')[pos] == 'flat%s' % str(n): |
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116 | self.params[name] = value |
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117 | continue |
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118 | elif name == 'n_layers': |
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119 | continue |
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120 | else: |
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121 | self.params[name] = value |
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122 | |
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123 | self.model.params['n_layers'] = self.n_layers |
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124 | |
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125 | # set constrained values for the original model params |
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126 | self._set_xtra_model_param() |
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127 | |
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128 | def _set_details(self): |
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129 | """ |
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130 | Concatenate details of the original model to create |
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131 | this model details |
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132 | """ |
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133 | for name, detail in self.model.details.iteritems(): |
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134 | if name in self.params.iterkeys(): |
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135 | self.details[name] = detail |
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136 | |
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137 | |
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138 | def _set_xtra_model_param(self): |
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139 | """ |
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140 | Set params of original model that are hidden from this model |
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141 | """ |
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142 | # look for the model parameters that are not in param list |
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143 | for key in self.model.params.iterkeys(): |
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144 | if key not in self.params.keys(): |
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145 | if key.split('_')[0] == 'thick': |
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146 | self.model.setParam(key, 0) |
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147 | continue |
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148 | if key.split('_')[0] == 'func': |
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149 | self.model.setParam(key, 0) |
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150 | continue |
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151 | for nshell in range(self.n_layers,max_nshells): |
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152 | if key.split('_')[1] == 'flat%s' % str(nshell+1): |
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153 | try: |
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154 | if key.split('_')[0] == 'sld': |
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155 | value = self.model.params['sld_medium'] |
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156 | elif key.split('_')[0] == 'sldIM': |
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157 | value = self.model.params['sldIM_medium'] |
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158 | self.model.setParam(key, value) |
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159 | except: |
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160 | raise RuntimeError, "ReflectivityModel problem" |
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161 | |
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162 | def _get_func_list(self): |
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163 | """ |
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164 | Get the list of functions in each layer (shell) |
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165 | """ |
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166 | #func_list = {} |
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167 | return func_list |
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168 | |
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169 | def getProfile(self): |
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170 | """ |
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171 | Get SLD profile |
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172 | |
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173 | : return: (z, beta) where z is a list of depth of the transition points |
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174 | beta is a list of the corresponding SLD values |
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175 | """ |
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176 | # max_pts for each layers |
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177 | n_sub = 21 |
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178 | z = [] |
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179 | beta = [] |
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180 | sub_range = int(floor(n_sub/2.0)) |
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181 | z.append(0) |
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182 | beta.append(self.params['sld_bottom0']) |
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183 | |
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184 | z0 = 0 |
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185 | # for layers from the top |
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186 | for n in range(1, self.n_layers+2): |
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187 | i = n |
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188 | |
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189 | for j in range(0, 2): |
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190 | for n_s in range(-sub_range, sub_range+1): |
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191 | dz = self.params['thick_inter%s' % str(i-1)]/n_sub |
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192 | if j == 1: |
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193 | if i == self.n_layers+1: |
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194 | break |
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195 | # shift half sub thickness for the first point |
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196 | z0 += dz/2.0 |
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197 | z.append(z0) |
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198 | #z0 -= dz/2.0 |
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199 | z0 += self.params['thick_flat%s' % str(i)] |
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200 | |
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201 | sld_i = self.params['sld_flat%s' % str(i)] |
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202 | beta.append(self.params['sld_flat%s' % str(i)]) |
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203 | else: |
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204 | if n_s == -sub_range: |
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205 | # shift half sub thickness for the first point |
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206 | z0 -= dz/2.0 |
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207 | #exec "dz = self.params['thick_inter[%s-1]'% str(i)]/9" |
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208 | #print "%d = %g \n"% (i,self.params['thick_inter3']) |
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209 | z0 += dz |
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210 | |
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211 | if i == 1: |
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212 | sld_l = self.params['sld_bottom0'] |
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213 | else: |
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214 | sld_l = self.params['sld_flat%s' % str(i-1)] |
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215 | if i == self.n_layers+1: |
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216 | sld_r = self.params['sld_medium'] |
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217 | else: |
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218 | sld_r = self.params['sld_flat%s' % str(i)] |
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219 | func_idx = self.params['func_inter%s' % str(i-1)] |
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220 | func = self._get_func(n_s, n_sub, func_idx) |
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221 | if sld_r > sld_l: |
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222 | sld_i = (sld_r-sld_l)*func+sld_l |
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223 | elif sld_r < sld_l: |
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224 | sld_i = (sld_l-sld_r)*(1-func)+sld_r |
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225 | else: |
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226 | sld_i = sld_r |
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227 | z.append(z0) |
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228 | beta.append(sld_i) |
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229 | if j == 1: |
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230 | break |
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231 | # put substrate and superstrate profile |
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232 | # shift half sub thickness for the first point |
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233 | z0 += dz/2.0 |
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234 | z.append(z0) |
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235 | beta.append(self.params['sld_medium']) |
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236 | z_ext = z0/6.0 |
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237 | |
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238 | # put the extra points for the substrate |
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239 | # and superstrate |
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240 | z.append(z0+z_ext) |
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241 | beta.append(self.params['sld_medium']) |
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242 | z.insert(0, -z_ext) |
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243 | beta.insert(0, self.params['sld_bottom0']) |
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244 | z = [z0 - x for x in z] |
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245 | z.reverse() |
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246 | beta.reverse() |
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247 | return z, beta |
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248 | |
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249 | def _get_func(self, index, n_sub, func_idx): |
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250 | """ |
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251 | Get the function asked to buil sld profile |
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252 | : param index: index of sub_layer |
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253 | : param n_sub: total number of sub_layer |
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254 | : param func_idx: an integer to identify a function |
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255 | |
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256 | : return out: the output from the function, float |
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257 | """ |
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258 | # cal bin_size |
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259 | bin_size = 1.0/n_sub |
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260 | # erf |
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261 | if func_idx == 0: |
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262 | out = erf(index/(n_sub/5.0))/2.0 + 0.5 |
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263 | return out |
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264 | else: |
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265 | index += 0.5 |
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266 | # linear |
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267 | if func_idx == 1: |
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268 | out = ((index + floor(n_sub/2.0))*bin_size) |
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269 | # r_parabolic |
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270 | elif func_idx == 2: |
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271 | out = ((index + floor(n_sub/2.0))*bin_size)* \ |
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272 | ((index + floor(n_sub/2.0))*bin_size) |
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273 | # l_parabolic |
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274 | elif func_idx == 3: |
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275 | out = 1.0-(((index + floor(n_sub/2.0))*bin_size) - 1.0) *\ |
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276 | (((index + floor(n_sub/2.0))*bin_size) - 1.0) |
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277 | # r_cubic |
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278 | elif func_idx == 4: |
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279 | out = ((index + floor(n_sub/2.0))*bin_size)* \ |
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280 | ((index + floor(n_sub/2.0))*bin_size)* \ |
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281 | ((index + floor(n_sub/2.0))*bin_size) |
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282 | # l_cubic |
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283 | elif func_idx == 5: |
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284 | out = 1.0+(((index + floor(n_sub/2.0)))*bin_size - 1.0) *\ |
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285 | (((index + floor(n_sub/2.0)))*bin_size - 1.0) *\ |
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286 | (((index + floor(n_sub/2.0)))*bin_size - 1.0) |
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287 | # return output |
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288 | return out |
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289 | |
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290 | def setParam(self, name, value): |
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291 | """ |
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292 | Set the value of a model parameter |
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293 | |
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294 | : param name: name of the parameter |
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295 | : param value: value of the parameter |
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296 | """ |
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297 | # set param to new model |
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298 | self._setParamHelper( name, value) |
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299 | |
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300 | ## setParam to model |
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301 | if name == 'sld_medium': |
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302 | # the sld_*** model.params not in params must set |
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303 | # to value of sld_solv |
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304 | for key in self.model.params.iterkeys(): |
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305 | if key not in self.params.keys()and key.split('_')[0] == 'sld': |
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306 | self.model.setParam(key, value) |
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307 | |
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308 | self.model.setParam( name, value) |
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309 | |
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310 | def _setParamHelper(self, name, value): |
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311 | """ |
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312 | Helper function to setParam |
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313 | """ |
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314 | |
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315 | # Look for standard parameter |
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316 | for item in self.params.keys(): |
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317 | if item.lower()==name.lower(): |
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318 | self.params[item] = value |
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319 | return |
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320 | |
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321 | raise ValueError, "Model does not contain parameter %s" % name |
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322 | |
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323 | |
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324 | def _set_fixed_params(self): |
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325 | """ |
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326 | Fill the self.fixed list with the model fixed list |
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327 | """ |
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328 | pass |
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329 | |
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330 | def run(self, x = 0.0): |
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331 | """ |
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332 | Evaluate the model |
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333 | |
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334 | :param x: input q, or [q,phi] |
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335 | |
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336 | :return: scattering function P(q) |
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337 | |
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338 | """ |
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339 | |
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340 | return self.model.run(x) |
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341 | |
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342 | def runXY(self, x = 0.0): |
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343 | """ |
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344 | Evaluate the model |
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345 | |
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346 | : param x: input q-value (float or [float, float] as [qx, qy]) |
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347 | : return: scattering function value |
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348 | """ |
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349 | |
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350 | return self.model.runXY(x) |
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351 | |
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352 | ## Now (May27,10) directly uses the model eval function |
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353 | ## instead of the for-loop in Base Component. |
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354 | def evalDistribution(self, x): |
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355 | """ |
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356 | Evaluate the model in cartesian coordinates |
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357 | |
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358 | : param x: input q[], or [qx[], qy[]] |
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359 | : return: scattering function P(q[]) |
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360 | """ |
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361 | # set effective radius and scaling factor before run |
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362 | return self.model.evalDistribution(x) |
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363 | |
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364 | def calculate_ER(self): |
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365 | """ |
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366 | """ |
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367 | return self.model.calculate_ER() |
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368 | |
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369 | def set_dispersion(self, parameter, dispersion): |
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370 | """ |
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371 | Set the dispersion object for a model parameter |
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372 | |
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373 | : param parameter: name of the parameter [string] |
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374 | :dispersion: dispersion object of type DispersionModel |
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375 | """ |
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376 | pass |
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