plotting 2 graph in same window using matplotlib in python

Question

I was plotting a line graph and a bar chart in matplotlib and both individually were working fine with my script.
but i'm facing a problem:
1. if i want to plot both graphs in the same output window
2. if i want to customize the display window to 1024*700

in 1 st case I was using subplot to plot two graphs in same window but i'm not being able to give both graphs their individual x-axis and y-axis names and also their individual title. my failed code is:

import numpy as np
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
xs,ys = np.loadtxt("c:/users/name/desktop/new folder/x/counter.cnt",delimiter = ',').T
fig = plt.figure()
lineGraph = fig.add_subplot(211)
barChart = fig.add_subplot(212)

plt.title('DISTRIBUTION of NUMBER')
lineGraph = lineGraph.plot(xs,ys,'-')  #generate line graph
barChart = barChart.bar(xs,ys,width=1.0,facecolor='g') #generate bar plot

plt.grid(True)
plt.axis([0,350,0,25])  #controlls axis for charts x first and then y axis.


plt.savefig('new.png',dpi=400)
plt.show()

but with this I am not being able to mark both graphs properly.
and also please site some idea about how to resize the window to 1024*700.

Possible duplicate of How to make several plots on a single page using matplotlib? — Joel Cornett
– Joel Cornett, Commented May 17, 2012 at 7:52
You should really only ask one question per post. So I would edit out the question about the window size, especially as the answer can be found here: stackoverflow.com/a/638443/623518. — Chris
– Chris, Commented May 17, 2012 at 9:53

Chris · Accepted Answer · 2012-05-17 12:29:42Z

When you say

I was using subplot to plot two graphs in same window but i'm not being able to give both graphs their individual x-axis and y-axis names and also their individual title.

do you mean you want to set axis labels? If so try using lineGraph.set_xlabel and lineGraph.set_ylabel. Alternatively, call plt.xlabel and plot.ylabel just after you create a plot and before you create any other plots. For example

# Line graph subplot
lineGraph = lineGraph.plot(xs,ys,'-')
lineGraph.set_xlabel('x')
lineGraph.set_ylabel('y')

# Bar graph subplot
barChart = barChart.bar(xs,ys,width=1.0,facecolor='g')
barChart.set_xlabel('x')
barChart.set_ylabel('y')

The same applies to the title. Calling plt.title will add a title to the currently active plot. This is the last plot that you created or the last plot you actived with plt.gca. If you want a title on a specific subplot use the subplot handle: lineGraph.set_title or barChart.set_title.

jiffyclub · Accepted Answer · 2012-05-20 00:12:50Z

0

fig.add_subplot returns a matplotlib Axes object. Methods on that object include set_xlabel and set_ylabel, as described by Chris. You can see the full set of methods available on Axes objects at http://matplotlib.sourceforge.net/api/axes_api.html.

answered May 20, 2012 at 0:12

jiffyclub

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