#!/usr/bin/python
  #-*-coding:utf8-*-
  from sys import argv
  from pylab import *
  
  if __name__ == "__main__":
      if len(argv) != 2:
          print "Usage: python", argv[0], " matrix.dat"
          exit (0)  
  
  
  f = open ( argv[1] , 'r')
  A = [ map(float,line.split()) for line in f ]
  
  figure(1)
  imshow(A, interpolation='nearest')
  grid(True)
  show()