How to use plotfile in matplotlib?

Question

I am trying to plot some data with the plotfile function of matplotlib, i.e.

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from matplotlib.pyplot import *
from numpy import *

x = arange(0,10,0.001)
y = sin(x)
savetxt("test.dat",column_stack((x,y)))

plotfile("test.dat",(0,))
show()

this gives me the following error

ValueError: invalid literal for float(): 1.000000000000000021e-03 9.99999833333341681

using the genfromtxt() function works perfect with the generated data so I don't see why there should be an error. Thank you for your help.

mechanical_meat · Accepted Answer · 2013-02-22 23:46:12Z

1

By default numpy.savetxt uses a single space as the column delimiter.

However, the default delimiter for matplotlib.pyplot.plotfile is a comma.

One way to fix is to specify a comma as the column-delimiter in your call to savetxt, e.g.:

import numpy as np 
np.savetxt("test.dat", np.column_stack((x, y)), delimiter=',')

answered Feb 22, 2013 at 23:46

mechanical_meat

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