docs: def printConcordance(concordance, prefix, tped, snps):
      """Print the concordance.
  
      :param concordance: the concordance.
      :param prefix: the prefix if the output files.
      :param tped: a representation of the ``tped`` of duplicated markers.
      :param snps: the position of the duplicated markers in the ``tped``.
  
      :type concordance: dict
      :type prefix: str
      :type tped: numpy.array
      :type snps: dict
  
      Prints the concordance in a file, in the format of a matrix. For each
      duplicated markers, the first line (starting with the `#` signs) contains
      the name of all the markers in the duplicated markers set. Then a :math:`N
      \\times N` matrix is printed to file (where :math:`N` is the number of
      markers in the duplicated marker list), containing the pairwise
      concordance.
  
      """
      outFile = None
      try:
          outFile = open(prefix + ".concordance", "w")
      except IOError:
          msg = "%s: can't write file" % prefix + ".concordance"
          raise ProgramError(msg)
  
      for snpID in concordance.iterkeys():
          print >>outFile, "#" + "\t".join(
              list(snpID) + list(tped[snps[snpID], 1])
          )
  
          # Doing the division
          true_concordance = np.true_divide(concordance[snpID][0],
                                            concordance[snpID][1])
  
          output = StringIO.StringIO()
          np.savetxt(output, true_concordance, delimiter="\t", fmt="%.8f")
          print >>outFile, output.getvalue().rstrip("\r\n")
  
      outFile.close()