将图表保存为PDF

Question

绘图模块

def plotGraph(X,Y):
    fignum = random.randint(0,sys.maxint)
    plt.figure(fignum)
    ### Plotting arrangements ###
    return fignum

主要模块

import matplotlib.pyplot as plt
### tempDLStats, tempDLlabels are the argument
plot1 = plotGraph(tempDLstats, tempDLlabels)
plot2 = plotGraph(tempDLstats_1, tempDLlabels_1)
plot3 = plotGraph(tempDLstats_2, tempDLlabels_2)
plt.show()

我想将所有图形plot1，plot2，plot3保存到单个PDF文件中。有没有办法实现它？我不能在主模块中包含plotGraph函数。

有一个名为pylab.savefig的函数，但只有当它与绘图模块一起放置时才会起作用。还有其他方法可以实现吗？

Answer 1

如果某人最终来自Google，希望将单个数字转换为.pdf（这就是我想要的）：

import matplotlib.pyplot as plt

f = plt.figure()
plt.plot(range(10), range(10), "o")
plt.show()

f.savefig("foo.pdf", bbox_inches='tight')

Answer 2

对于单个pdf文件中的多个图表，您可以使用PdfPages

在plotGraph函数中，您应返回图形，而不是调用图形对象的savefig。

------绘图模块------

def plotGraph(X,Y):
      fig = plt.figure()
      ### Plotting arrangements ###
      return fig

------绘图模块------

----- mainModule ----

from matplotlib.backends.backend_pdf import PdfPages

plot1 = plotGraph(tempDLstats, tempDLlabels)
plot2 = plotGraph(tempDLstats_1, tempDLlabels_1)
plot3 = plotGraph(tempDLstats_2, tempDLlabels_2)

pp = PdfPages('foo.pdf')
pp.savefig(plot1)
pp.savefig(plot2)
pp.savefig(plot3)
pp.close()

Answer 3

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

# Create the PdfPages object to which we will save the pages:
# The with statement makes sure that the PdfPages object is closed properly at
# the end of the block, even if an Exception occurs.
with PdfPages('multipage_pdf.pdf') as pdf:
    plt.figure(figsize=(3, 3))
    plt.plot(range(7), [3, 1, 4, 1, 5, 9, 2], 'r-o')
    plt.title('Page One')
    pdf.savefig()  # saves the current figure into a pdf page
    plt.close()

    plt.rc('text', usetex=True)
    plt.figure(figsize=(8, 6))
    x = np.arange(0, 5, 0.1)
    plt.plot(x, np.sin(x), 'b-')
    plt.title('Page Two')
    pdf.savefig()
    plt.close()

    plt.rc('text', usetex=False)
    fig = plt.figure(figsize=(4, 5))
    plt.plot(x, x*x, 'ko')
    plt.title('Page Three')
    pdf.savefig(fig)  # or you can pass a Figure object to pdf.savefig
    plt.close()

    # We can also set the file's metadata via the PdfPages object:
    d = pdf.infodict()
    d['Title'] = 'Multipage PDF Example'
    d['Author'] = u'Jouni K. Sepp\xe4nen'
    d['Subject'] = 'How to create a multipage pdf file and set its metadata'
    d['Keywords'] = 'PdfPages multipage keywords author title subject'
    d['CreationDate'] = datetime.datetime(2009, 11, 13)
    d['ModDate'] = datetime.datetime.today()

Answer 4

没关系有办法做到这一点。

def plotGraph(X,Y):
     fignum = random.randint(0,sys.maxint)
     fig = plt.figure(fignum)
     ### Plotting arrangements ###
     return fig

------绘图模块------

----- mainModule ----

 import matplotlib.pyplot as plt
 ### tempDLStats, tempDLlabels are the argument
 plot1 = plotGraph(tempDLstats, tempDLlabels)
 plot2 = plotGraph(tempDLstats_1, tempDLlabels_1)
 plot3 = plotGraph(tempDLstats_2, tempDLlabels_2)
 plt.show()
 plot1.savefig('plot1.png')
 plot2.savefig('plot2.png')
 plot3.savefig('plot3.png')

----- mainModule -----