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1 #!/usr/bin/env python
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2 # Code by Boris Rebolledo-Jaramillo
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3 # (boris-at-bx.psu.edu)
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4 # Edited by Nick Stoler
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5 # (nick-at-bx.psu.edu)
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6 # New in this version:
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7 # - Add in proper header line if not present
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8
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9 import os
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10 import sys
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11 import numpy
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12 from rpy2.robjects import Formula
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13 from rpy2.robjects.packages import importr
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14 from rpy2 import robjects
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15
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16 def fail(message):
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17 sys.stderr.write(message+'\n')
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18 sys.exit(1)
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19
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20 COLUMN_LABELS = ['SAMPLE', 'CHR', 'POS', 'A', 'C', 'G', 'T', 'CVRG',
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21 'ALLELES', 'MAJOR', 'MINOR', 'MINOR.FREQ.PERC.'] #, 'STRAND.BIAS']
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22
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23 args = sys.argv[1:]
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24 if len(args) >= 1:
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25 infile = args[0]
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26 else:
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27 fail('Error: No input filename provided (as argument 1).')
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28 if len(args) >= 2:
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29 outfile = args[1]
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30 else:
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31 fail('Error: No output filename provided (as argument 2).')
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32 if len(args) >= 3:
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33 report = args[2]
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34 else:
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35 report = ''
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36
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37 # Check input file
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38 add_header = False
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39 if not os.path.exists(infile):
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40 fail('Error: Input file '+infile+' could not be found.')
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41 with open(infile, 'r') as lines:
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42 line = lines.readline()
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43 if not line:
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44 fail('Error: Input file seems to be empty')
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45 line = line.strip().lstrip('#') # rm whitespace, comment chars
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46 labels = line.split("\t")
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47 if 'SAMPLE' not in labels or labels[11] != 'MINOR.FREQ.PERC.':
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48 sys.stderr.write("Error: Input file does not seem to have a proper header "
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49 +"line.\nAdding an artificial header..")
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50 add_header = True
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51
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52 base = importr('base')
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53 utils = importr('utils')
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54 stats = importr('stats')
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55 rprint = robjects.globalenv.get("print")
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56 graphics = importr('graphics')
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57 grdevices = importr('grDevices')
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58 grdevices.png(file=outfile, width=1024, height=768)
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59
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60 # Read file into a data frame
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61 if add_header:
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62 # add header line manually if not present
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63 DATA = utils.read_delim(infile, header=False)
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64 labels = robjects.r.names(DATA)
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65 for i in range(len(labels)):
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66 try:
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67 labels[i] = COLUMN_LABELS[i]
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68 except IndexError, e:
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69 fail("Error in input file: Too many columns (does not match hardcoded "
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70 +"column labels).")
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71 else:
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72 DATA = utils.read_delim(infile)
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73 # Remove comment from header, if present
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74 labels = robjects.r.names(DATA)
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75 if labels[0][0:2] == 'X.':
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76 labels[0] = labels[0][2:]
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77
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78 # Multiply minor allele frequencies by 100 to get percentage
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79 # .rx2() looks up a column by its label and returns it as a vector
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80 # .ro turns the returned object into one that can be operated on per-element
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81 minor_freq = DATA.rx2('MINOR.FREQ.PERC.').ro * 100
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82 samples = DATA.rx2('SAMPLE')
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83
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84 # Formula() creates a Python object representing the R object returned by x ~ y
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85 formula = Formula('minor_freq ~ samples')
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86 # The "environment" in .getenvironment() is the entire R workspace in which the
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87 # Formula object exists. The R workspace meaning all the defined variables.
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88 # Here, the .getenvironment() method is being used to set some variables in the
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89
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90 # R workspace
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91 formula.getenvironment()['minor_freq'] = minor_freq
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92 formula.getenvironment()['samples'] = samples
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93
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94 # create boxplot - fill kwargs1 with the options for the boxplot function
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95 kwargs1 = {'ylab':"Minor allele frequency (%)", 'col':"gray", 'xaxt':"n",
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96 'outpch':"*",'main':"Distribution of minor allele frequencies",
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97 'cex.lab':"1.5"}
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98 p = graphics.boxplot(formula, **kwargs1)
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99 table = base.table(DATA.rx2('SAMPLE'))
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100 graphics.text(0.5, 1, 'N:', font=2)
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101 for i in range(1, base.length(table)[0]+1, 1):
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102 graphics.text(i, 1, table[i-1], font=2)
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103
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104 graphlabels = base.names(table)
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105 kwargs3 = {'pos':"0", 'las':"2", 'cex.axis':"1"}
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106 graphics.axis(1, at=range(1, len(graphlabels)+1, 1), labels=graphlabels, **kwargs3)
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107 grdevices.dev_off()
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108
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109 if not report:
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110 sys.exit(0)
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111
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112
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113 ####################################
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114 # GENERATE REPORT
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115 # report should be something like:
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116 # SAMPLE NoHET MEDIAN MAD TEST
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117 # s1 7 10% n p/w/f
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118 # n <= 5 pass
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119 # 6 <= n <=10 warn
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120 # n >= 11 fail
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121 # MAD <= 2.0 fail
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122 # MAD > 2.0 pass
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123 ###################################
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124
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125 SAMPLES=[]
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126 for i in range(len(table)):
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127 SAMPLES.append(base.names(table)[i])
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128
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129 def boxstats(data,sample):
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130 VALUES = [100*float(x.strip().split('\t')[11]) for x in list(open(data)) if x.strip().split('\t')[0]==sample]
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131 NoHET = len(VALUES)
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132 MEDIAN = numpy.median(VALUES)
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133 MAD = numpy.median([abs(i - MEDIAN) for i in VALUES]) # Median absolute distance (robust spread statistic)
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134 return [NoHET,MEDIAN, MAD]
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135
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136 boxreport = open(report, "w+")
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137 boxreport.write("SAMPLE\tTOTAL.SITES\tMEDIAN.FREQ.\tMAD.FREQ\tEVAL\n")
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138 for sample in SAMPLES:
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139 ENTRY = [sample] + boxstats(infile,sample)
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140 if ENTRY[1] <= 5:
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141 ENTRY.append('pass')
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142 elif 6 <= ENTRY[1] <=10:
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143 ENTRY.append('warn')
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144 elif ENTRY[1] >= 11:
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145 ENTRY.append('fail')
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146 if ENTRY[3] <=2.0:
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147 ENTRY.append('fail')
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148 elif ENTRY[3] >2.0:
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149 ENTRY.append('pass')
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150 if len(set(ENTRY[4:6])) == 2:
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151 ENTRY.append('warn')
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152 else:
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153 ENTRY.append(list(set(ENTRY[4:6]))[0])
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154 boxreport.write ('%s\t%d\t%.1f\t%.1f\t%s\n' % tuple([ENTRY[i] for i in [0,1,2,3,6]]))
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155
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156 boxreport.close()
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157
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158
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159
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160
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