Draw several graphs in matplotlib, python

Question

I need to draw graphs in python matplotlib.

For each graph I do some calculates before and then draw the graphe. Here is some of the code:

import matplotlib.pyplot as plt

def draw(LuxCoordinates, finalPix, verName):
    plt.axes([0.2, 0.2, 0.7, 0.6]);
    plt.xlim(0,3500); #Axis x
    plt.ylim(0,100); #Axis y
    plt.plot(LuxCoordinates, finalPix, 'g');
    plt.scatter(LuxCoordinates, finalPix, linewidths=1)
    plt.grid(axis)
    plt.xlabel('X_Coordinates', color='r');
    plt.ylabel('Y_Coordinates', color='r');
    plt.title(verName, color='#afeeee');
    savefig(verName+'.png');
    plt.show();

My problem is that I call to this function twice or more, according to the number of graphs I have, I get the graphs in separate plots, but I want to draw all graphs on the same plot, in order to compare them. How can I do it? Thank you all!

behzad.nouri · Accepted Answer · 2013-12-04 12:35:13Z

4

remove plt.show()

your function should get a figure or axis as an input parameter, and do the plotting on that figure, and then outside the function when you have done all the plotting you may call plt.show()

here is a minimal example:

import matplotlib.pyplot as plt
import numpy as np

def plotter ( ax, col ):
    data = np.random.normal( size=(50, 2 ) )
    x, y = data[:, 0], data[:, 1 ]
    ax.scatter( x, y, color=col )

fig = plt.figure()
ax = fig.add_axes([0.2, 0.2, 0.7, 0.6])

plotter( ax, 'Blue' )
plotter( ax, 'Red' )
fig.show( )

edited Dec 4, 2013 at 12:35

answered Dec 4, 2013 at 12:21

behzad.nouri

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1 Comment

shlomi Over a year ago

Thanks a lot, I just remove plt.show() and put it after all calls to the draw function.

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