Saving plots to pdf files using matplotlib

Question

I want to save more than 1 plot to a pdf file. Here is my code:

import matplotlib.pyplot as plt
from matplotlib.backends.backend_pdf import PdfPages

def function_plot(X,Y):
    plt.figure()
    plt.clf()

    pp = PdfPages('test.pdf')

    graph = plt.title('y vs x')
    plt.xlabel('x axis', fontsize = 13)
    plt.ylabel('y axis', fontsize = 13)
    pp.savefig(graph)


function_plot(x1,y1)
function_plot(x2,y2)

I know that my ideas are scrambled but I can't find the way to write my code. The thing is that I need my graphs to have labeled x and y axis.

aloha · Accepted Answer · 2014-01-26 23:34:19Z

22

I was able to solve it. My mistake was that pp.savefig() should not take arguments.

Here is my final code:

from matplotlib.backends.backend_pdf import PdfPages
import numpy as np
import matplotlib.pyplot as plt

x1 = np.arange(10)
y1 = x1**2

x2 = np.arange(20)
y2 = x2**2

pp = PdfPages('test.pdf')


def function_plot(X,Y):
    plt.figure()
    plt.clf()

    plt.plot(X,Y)
    plt.title('y vs x')
    plt.xlabel('x axis', fontsize = 13)
    plt.ylabel('y axis', fontsize = 13)
    pp.savefig()

function_plot(x1,y1)
function_plot(x2,y2)

pp.close()

edited Jan 26, 2014 at 23:34

answered Jan 26, 2014 at 20:17

aloha

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Comments

M4rtini · Accepted Answer · 2014-01-26 14:21:04Z

6

Try this.

from matplotlib.backends.backend_pdf import PdfPages
import numpy as np
import matplotlib.pyplot as plt

x1 = np.arange(10)
y1 = x1**2

x2 = np.arange(20)
y2 = x2**2

def function_plot(X,Y, pp):
    plt.figure()
    plt.clf()

    plt.plot(X,Y)
    graph = plt.title('y vs x')
    plt.xlabel('x axis', fontsize = 13)
    plt.ylabel('y axis', fontsize = 13)
    pp.savefig(plt.gcf())


with PdfPages('test.pdf') as pp:
    function_plot(x1,y1, pp)
    function_plot(x2,y2, pp)

answered Jan 26, 2014 at 14:21

M4rtini

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2 Comments

aloha Over a year ago

Here is the error I got: AttributeErrror: __exit__ I wrote pp.close() at the end of the with loop but still I got the same error.

climate-coder Over a year ago

when you use this function with a 'with' statement, the exit is handled by the context manager. There's. no need for you to separately close this out.

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