Mercurial Hosting > traffic-intelligence
annotate python/utils.py @ 306:93d851d0d21e
bug correction, minor work on indicators
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Tue, 02 Apr 2013 15:27:42 -0400 |
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1 #! /usr/bin/env python |
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2 ''' Generic utilities.''' |
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3 |
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4 #from numpy import * |
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5 #from pylab import * |
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6 |
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7 __metaclass__ = type |
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8 |
45
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9 commentChar = '#' |
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10 |
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11 delimiterChar = '%'; |
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12 |
185
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13 ######################### |
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14 # Enumerations |
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15 ######################### |
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16 |
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17 def inverseEnumeration(l): |
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18 'Returns the dictionary that provides for each element in the input list its index in the input list' |
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19 result = {} |
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20 for i,x in enumerate(l): |
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21 result[x] = i |
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22 return result |
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23 |
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24 ######################### |
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25 # CLI utils |
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26 ######################### |
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27 |
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28 def parseCLIOptions(helpMessage, options, cliArgs, optionalOptions=[]): |
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29 ''' Simple function to handle similar argument parsing |
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30 Returns the dictionary of options and their values |
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31 |
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32 * cliArgs are most likely directly sys.argv |
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33 (only the elements after the first one are considered) |
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34 |
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35 * options should be a list of strings for getopt options, |
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36 eg ['frame=','correspondences=','video='] |
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37 A value must be provided for each option, or the program quits''' |
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38 import sys, getopt |
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39 from numpy.core.fromnumeric import all |
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40 optionValues, args = getopt.getopt(cliArgs[1:], 'h', ['help']+options+optionalOptions) |
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41 optionValues = dict(optionValues) |
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42 |
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43 if '--help' in optionValues.keys() or '-h' in optionValues.keys(): |
181
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44 print(helpMessage+ |
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45 '\n - Compulsory options: '+' '.join([opt.replace('=','') for opt in options])+ |
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46 '\n - Non-compulsory options: '+' '.join([opt.replace('=','') for opt in optionalOptions])) |
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47 sys.exit() |
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48 |
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49 missingArgument = [('--'+opt.replace('=','') in optionValues.keys()) for opt in options] |
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50 if not all(missingArgument): |
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51 print('Missing argument') |
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52 print(optionValues) |
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53 sys.exit() |
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54 |
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55 return optionValues |
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56 |
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57 ######################### |
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58 # simple statistics |
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59 ######################### |
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60 |
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61 def confidenceInterval(mean, stdev, nSamples, percentConfidence, printLatex = False): |
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62 from math import sqrt |
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63 from scipy.stats.distributions import norm |
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64 k = round(norm.ppf(0.5+percentConfidence/200., 0, 1)*100)/100. # 1.-(100-percentConfidence)/200. |
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65 e = k*stdev/sqrt(nSamples) |
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66 if printLatex: |
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67 print('${0} \pm {1}\\frac{{{2}}}{{\sqrt{{{3}}}}}$'.format(mean, k, stdev, nSamples)) |
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68 return mean-e, mean+e |
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69 |
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70 def computeChi2(expected, observed): |
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71 '''Returns the Chi2 statistics''' |
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72 result = 0. |
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73 for e, o in zip(expected, observed): |
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74 result += ((e-o)*(e-o))/e |
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75 return result |
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76 |
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77 class EmpiricalDistribution: |
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78 def nSamples(self): |
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79 return sum(self.counts) |
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80 |
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81 def cumulativeDensityFunction(sample): |
276 | 82 '''Returns the cumulative density function of the sample of a random variable''' |
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83 from numpy.core.multiarray import array |
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84 from numpy.lib.function_base import unique |
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85 from numpy.core.fromnumeric import sum |
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86 a = array(sample) |
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87 a.sort() |
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88 xaxis = unique(a) |
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89 counts = [sum(a <= x) for x in xaxis] |
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90 return xaxis, counts |
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91 |
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92 class EmpiricalDiscreteDistribution(EmpiricalDistribution): |
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93 '''Class to represent a sample of a distribution for a discrete random variable |
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94 ''' |
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95 from numpy.core.fromnumeric import sum |
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96 |
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97 def __init__(self, categories, counts): |
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98 self.categories = categories |
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99 self.counts = counts |
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100 |
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101 def mean(self): |
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102 result = [float(x*y) for x,y in zip(self.categories, self.counts)] |
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103 return sum(result)/self.nSamples() |
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104 |
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105 def var(self, mean = None): |
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106 if not mean: |
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107 m = self.mean() |
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108 else: |
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109 m = mean |
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110 result = 0. |
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111 squares = [float((x-m)*(x-m)*y) for x,y in zip(self.categories, self.counts)] |
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112 return sum(squares)/(self.nSamples()-1) |
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113 |
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114 def referenceCounts(self, probability): |
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115 '''probability is a function that returns the probability of the random variable for the category values''' |
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116 refProba = [probability(c) for c in self.categories] |
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117 refProba[-1] = 1-sum(refProba[:-1]) |
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118 refCounts = [r*self.nSamples() for r in refProba] |
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119 return refCounts, refProba |
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120 |
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121 class EmpiricalContinuousDistribution(EmpiricalDistribution): |
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122 '''Class to represent a sample of a distribution for a continuous random variable |
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123 with the number of observations for each interval |
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124 intervals (categories variable) are defined by their left limits, the last one being the right limit |
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125 categories contain therefore one more element than the counts''' |
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126 def __init__(self, categories, counts): |
276 | 127 # todo add samples for initialization and everything to None? (or setSamples?) |
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128 self.categories = categories |
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129 self.counts = counts |
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130 |
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131 def mean(self): |
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132 result = 0. |
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133 for i in range(len(self.counts)-1): |
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134 result += self.counts[i]*(self.categories[i]+self.categories[i+1])/2 |
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135 return result/self.nSamples() |
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136 |
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137 def var(self, mean = None): |
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138 if not mean: |
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139 m = self.mean() |
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140 else: |
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141 m = mean |
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142 result = 0. |
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143 for i in range(len(self.counts)-1): |
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144 mid = (self.categories[i]+self.categories[i+1])/2 |
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145 result += self.counts[i]*(mid - m)*(mid - m) |
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146 return result/(self.nSamples()-1) |
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147 |
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148 def referenceCounts(self, cdf): |
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149 '''cdf is a cumulative distribution function |
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150 returning the probability of the variable being less that x''' |
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151 # refCumulativeCounts = [0]#[cdf(self.categories[0][0])] |
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152 # for inter in self.categories: |
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153 # refCumulativeCounts.append(cdf(inter[1])) |
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154 refCumulativeCounts = [cdf(x) for x in self.categories[1:-1]] |
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155 |
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156 refProba = [refCumulativeCounts[0]] |
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157 for i in xrange(1,len(refCumulativeCounts)): |
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158 refProba.append(refCumulativeCounts[i]-refCumulativeCounts[i-1]) |
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159 refProba.append(1-refCumulativeCounts[-1]) |
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160 refCounts = [p*self.nSamples() for p in refProba] |
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161 |
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162 return refCounts, refProba |
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163 |
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164 def printReferenceCounts(self, refCounts=None): |
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165 if refCounts: |
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166 ref = refCounts |
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167 else: |
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168 ref = self.referenceCounts |
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169 for i in xrange(len(ref[0])): |
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170 print('{0}-{1} & {2:0.3} & {3:0.3} \\\\'.format(self.categories[i],self.categories[i+1],ref[1][i], ref[0][i])) |
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171 |
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172 |
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173 ######################### |
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174 # maths section |
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175 ######################### |
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176 |
285
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177 def LCSS(l1, l2, threshold, distance, delta = float('inf')): |
284
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178 '''returns the longest common subsequence similarity |
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179 based on the threshold on distance between two elements of lists l1, l2 |
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180 ''' |
284
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181 from numpy import zeros, int as npint |
279
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182 m = len(l1) |
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183 n = len(l2) |
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184 similarity = zeros((m+1,n+1), dtype = npint) |
279
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185 for i in xrange(1,m+1): |
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186 for j in xrange(max(1,i-delta),min(n+1,i+delta)): |
286
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187 if distance(l1[i-1], l2[j-1])<=threshold: |
281
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188 similarity[i][j] = similarity[i-1][j-1]+1 |
279
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189 else: |
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190 similarity[i][j] = max(similarity[i-1][j], similarity[i][j-1]) |
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191 return similarity[-1][-1] |
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192 |
248
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193 def framesToTime(nFrames, frameRate, initialTime = (0.,0.,0.)): |
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194 'returns hour, minutes and seconds' |
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195 from math import floor |
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196 from datetime import time |
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197 seconds = int(floor(float(nFrames)/float(frameRate))+initialTime[0]*3600+initialTime[1]*60+initialTime[2]) |
261
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198 h = int(floor(seconds/3600.)) |
248
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199 seconds = seconds - h*3600 |
261
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200 m = int(floor(seconds/60)) |
248
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201 seconds = seconds - m*60 |
262
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202 return time(h, m, seconds) |
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203 |
241
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204 def sortXY(X,Y): |
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205 'returns the sorted (x, Y(x)) sorted on X' |
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206 D = {} |
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207 for x, y in zip(X,Y): |
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208 D[x]=y |
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209 xsorted = sorted(D.keys()) |
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210 return xsorted, [D[x] for x in xsorted] |
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211 |
32 | 212 def ceilDecimals(v, nDecimals): |
213 '''Rounds the number at the nth decimal | |
214 eg 1.23 at 0 decimal is 2, at 1 decimal is 1.3''' | |
215 from math import ceil,pow | |
216 tens = pow(10,nDecimals) | |
217 return ceil(v*tens)/tens | |
218 | |
152
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219 def inBetween(bound1, bound2, x): |
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220 return bound1 <= x <= bound2 or bound2 <= x<= bound1 |
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221 |
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222 def crossProduct(l1, l2): |
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223 return l1[0]*l2[1]-l1[1]*l2[0] |
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224 |
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225 def filterMovingWindow(input, halfWidth): |
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226 '''Returns an array obtained after the smoothing of the input by a moving average |
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227 The first and last points are copied from the original.''' |
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228 width = float(halfWidth*2+1) |
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229 win = ones(width,'d') |
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230 result = convolve(win/width,array(inputSignal),'same') |
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231 result[:halfWidth] = inputSignal[:halfWidth] |
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232 result[-halfWidth:] = inputSignal[-halfWidth:] |
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233 return result |
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234 |
199
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235 def linearRegression(x, y, deg = 1, plotData = False): |
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236 '''returns the least square estimation of the linear regression of y = ax+b |
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237 as well as the plot''' |
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238 from numpy.lib.polynomial import polyfit |
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239 from matplotlib.pyplot import plot |
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240 from numpy.core.multiarray import arange |
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241 coef = polyfit(x, y, deg) |
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242 if plotData: |
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243 def poly(x): |
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244 result = 0 |
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245 for i in range(len(coef)): |
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246 result += coef[i]*x**(len(coef)-i-1) |
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247 return result |
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248 plot(x, y, 'x') |
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249 xx = arange(min(x), max(x),(max(x)-min(x))/1000) |
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250 plot(xx, [poly(z) for z in xx]) |
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251 return coef |
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252 |
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253 ######################### |
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254 # plotting section |
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255 ######################### |
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256 |
297
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257 def stepPlot(X, firstX, lastX, initialCount = 0): |
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258 '''for each value in x, increment by one the initial count |
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259 returns the lists that can be plotted |
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260 to obtain a step plot increasing by one for each value in x, from first to last value''' |
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261 |
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262 sortedX = [] |
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263 counts = [initialCount] |
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264 for x in sorted(X): |
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265 sortedX += [x,x] |
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266 counts.append(counts[-1]) |
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267 counts.append(counts[-1]+1) |
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268 counts.append(counts[-1]) |
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269 return [firstX]+sortedX+[lastX], counts |
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270 |
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271 class PlottingPropertyValues: |
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272 def __init__(self, values): |
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273 self.values = values |
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274 |
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275 def __getitem__(self, i): |
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276 return self.values[i%len(self.values)] |
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277 |
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278 markers = PlottingPropertyValues(['+', '*', ',', '.', 'x', 'D', 's', 'o']) |
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279 scatterMarkers = PlottingPropertyValues(['s','o','^','>','v','<','d','p','h','8','+','x']) |
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280 |
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281 linestyles = PlottingPropertyValues(['-', '--', '-.', ':']) |
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282 |
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283 colors = PlottingPropertyValues('brgmyck') # 'w' |
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284 |
115
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285 def plotIndicatorMap(indicatorMap, squareSize, masked = True, defaultValue=-1): |
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286 from numpy import array, arange, ones, ma |
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287 from matplotlib.pyplot import pcolor |
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288 coords = array(indicatorMap.keys()) |
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289 minX = min(coords[:,0]) |
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290 minY = min(coords[:,1]) |
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291 X = arange(minX, max(coords[:,0])+1.1)*squareSize |
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292 Y = arange(minY, max(coords[:,1])+1.1)*squareSize |
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293 C = defaultValue*ones((len(Y), len(X))) |
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294 for k,v in indicatorMap.iteritems(): |
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295 C[k[1]-minY,k[0]-minX] = v |
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296 if masked: |
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297 pcolor(X, Y, ma.masked_where(C==defaultValue,C)) |
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298 else: |
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299 pcolor(X, Y, C) |
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300 |
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301 ######################### |
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302 # file I/O section |
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303 ######################### |
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304 |
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305 def openCheck(filename, option = 'r', quit = False): |
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306 '''Open file filename in read mode by default |
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307 and checks it is open''' |
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308 try: |
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309 return open(filename, option) |
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310 except IOError: |
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311 print 'File %s could not be opened.' % filename |
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312 if quit: |
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313 from sys import exit |
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314 exit() |
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315 return None |
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316 |
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317 def readline(f, commentCharacter = commentChar): |
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318 '''Modified readline function to skip comments.''' |
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319 s = f.readline() |
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320 while (len(s) > 0) and s.startswith(commentCharacter): |
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321 s = f.readline() |
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322 return s.strip() |
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323 |
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324 def getLines(f, delimiterCharacter = delimiterChar): |
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325 '''Gets a complete entry (all the lines) in between delimiterChar.''' |
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326 dataStrings = [] |
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327 s = readline(f) |
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328 while (len(s) > 0) and (not s.startswith(delimiterCharacter)): |
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329 dataStrings += [s.strip()] |
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330 s = readline(f) |
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331 return dataStrings |
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332 |
304
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333 class FakeSecHead(object): |
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334 '''Add fake section header [asection] |
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335 |
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336 from http://stackoverflow.com/questions/2819696/parsing-properties-file-in-python/2819788#2819788 |
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337 use read_file in Python 3.2+ |
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338 ''' |
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339 def __init__(self, fp): |
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340 self.fp = fp |
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341 self.sechead = '[main]\n' |
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342 |
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343 def readline(self): |
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344 if self.sechead: |
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345 try: return self.sechead |
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346 finally: self.sechead = None |
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347 else: return self.fp.readline() |
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348 |
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349 def removeExtension(filename, delimiter = '.'): |
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350 '''Returns the filename minus the extension (all characters after last .)''' |
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351 i = filename.rfind(delimiter) |
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352 if i>0: |
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353 return filename[:i] |
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354 else: |
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355 return filename |
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356 |
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357 def cleanFilename(s): |
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358 'cleans filenames obtained when contatenating figure characteristics' |
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359 return s.replace(' ','-').replace('.','').replace('/','-') |
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360 |
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361 def listfiles(dirname, extension, remove = False): |
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362 '''Returns the list of files with the extension in the directory dirname |
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363 If remove is True, the filenames are stripped from the extension''' |
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364 from os import listdir |
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365 tmp = [f for f in listdir(dirname) if f.endswith(extension)] |
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366 tmp.sort() |
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367 if remove: |
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368 return [removeExtension(f, extension) for f in tmp] |
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369 else: |
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370 return tmp |
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371 |
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372 def mkdir(dirname): |
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373 'Creates a directory if it does not exist' |
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374 import os |
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375 if not os.path.exists(dirname): |
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376 os.mkdir(dirname) |
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377 else: |
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378 print(dirname+' already exists') |
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379 |
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380 def removeFile(filename): |
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381 '''Deletes the file while avoiding raising an error |
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382 if the file does not exist''' |
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383 import os |
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384 if (os.path.exists(filename)): |
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385 os.remove(filename) |
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386 else: |
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387 print(filename+' does not exist') |
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388 |
19 | 389 def plotPolygon(poly, options = ''): |
390 from numpy.core.multiarray import array | |
391 from matplotlib.pyplot import plot | |
392 from shapely.geometry import Polygon | |
393 | |
394 tmp = array(poly.exterior) | |
395 plot(tmp[:,0], tmp[:,1], options) | |
396 | |
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397 def line2Floats(l, separator=' '): |
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398 '''Returns the list of floats corresponding to the string''' |
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399 return [float(x) for x in l.split(separator)] |
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400 |
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401 def line2Ints(l, separator=' '): |
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402 '''Returns the list of ints corresponding to the string''' |
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403 return [int(x) for x in l.split(separator)] |
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404 |
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405 ######################### |
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406 # sqlite |
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407 ######################### |
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408 |
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409 def dropTables(connection, tableNames): |
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410 'deletes the table with names in tableNames' |
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411 cursor = connection.cursor() |
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412 for tableName in tableNames: |
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413 cursor.execute('DROP TABLE '+tableName) |
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414 |
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415 ######################### |
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416 # running tests |
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417 ######################### |
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418 |
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419 if __name__ == "__main__": |
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420 import doctest |
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421 import unittest |
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422 suite = doctest.DocFileSuite('tests/utils.txt') |
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423 #suite = doctest.DocTestSuite() |
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424 unittest.TextTestRunner().run(suite) |
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425 #doctest.testmod() |
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426 #doctest.testfile("example.txt") |