Hi,
In my script a variable number of graphs is generated. I want to place
them in one column with arbitrary number of rows onto an A4 canvas (for
pdf export).
Unfortunately the figsize directive seems to have no effect. The figure
is always 8x6 inch.
Which code do I have to use in this case?
My minimal code:
#######################################
import matplotlib.pyplot as plt
from matplotlib.backends.backend_pdf import PdfPages
import numpy as np
x = np.arange(10)
y = np.arange(10)
fig_width_cm = 21 # A4 page
fig_height_cm = 29.7
inches_per_cm = 1 / 2.58 # Convert cm to inches
fig_width = fig_width_cm * inches_per_cm # width in inches
fig_height = fig_height_cm * inches_per_cm # height in inches
fig_size = [fig_width, fig_height]
pdf = PdfPages('outfile.pdf')
fig = plt.figure(figsize = fig_size)
allplots = 3 # This is the variable number of subplots
f, axarr = plt.subplots(allplots, 1)
for plot in range(allplots):
axarr[plot].plot(x+plot, y)
pdf.savefig()
pdf.close()
On Mon, Jun 25, 2012 at 1:12 PM, mogliii <mo...@gm...> wrote:
> Hi,
>
> In my script a variable number of graphs is generated. I want to place
> them in one column with arbitrary number of rows onto an A4 canvas (for
> pdf export).
>
> Unfortunately the figsize directive seems to have no effect. The figure
> is always 8x6 inch.
>
> Which code do I have to use in this case?
>
>
> My minimal code:
> #######################################
>
> import matplotlib.pyplot as plt
> from matplotlib.backends.backend_pdf import PdfPages
> import numpy as np
>
> x = np.arange(10)
> y = np.arange(10)
>
> fig_width_cm = 21 # A4 page
> fig_height_cm = 29.7
> inches_per_cm = 1 / 2.58 # Convert cm to inches
> fig_width = fig_width_cm * inches_per_cm # width in inches
> fig_height = fig_height_cm * inches_per_cm # height in inches
> fig_size = [fig_width, fig_height]
>
>
> pdf = PdfPages('outfile.pdf')
> fig = plt.figure(figsize = fig_size)
> allplots = 3 # This is the variable number of subplots
> f, axarr = plt.subplots(allplots, 1)
>
>
> for plot in range(allplots):
> axarr[plot].plot(x+plot, y)
>
> pdf.savefig()
> pdf.close()
>
>
Your call to "plt.subplots" is creating a new figure object, which never
gets the figsize parameter (only the old figure object has that set).
Cheers!
Ben Root
On 25/06/12 18:30, Benjamin Root wrote:
>
>
>
> Your call to "plt.subplots" is creating a new figure object, which
> never gets the figsize parameter (only the old figure object has that
> set).
>
> Cheers!
> Ben Root
>
Hi,
indeed you are right. I added "f.set_size_inches(fig_size)" and it works
Also I had a wrong conversion of inch to cm (2.58 before).
Thank you for your help,
Mogliii
The final code:
#################
import matplotlib.pyplot as plt
from matplotlib.backends.backend_pdf import PdfPages
import numpy as np
x = np.arange(10)
y = np.arange(10)
fig_width_cm = 21 # A4 page
fig_height_cm = 29.7
inches_per_cm = 1 / 2.54 # Convert cm to inches
fig_width = fig_width_cm * inches_per_cm # width in inches
fig_height = fig_height_cm * inches_per_cm # height in inches
fig_size = [fig_width, fig_height]
pdf = PdfPages('outfile.pdf')
allplots = 3 # This is the variable number of subplots
f, axarr = plt.subplots(allplots, 1)
f.set_size_inches(fig_size)
for plot in range(allplots):
axarr[plot].plot(x + plot, y)
pdf.savefig()
pdf.close()
Even better: f, axarr = plt.subplots(allplots, 1, figsize = fig_size) Its always difficult to predict which **kwargs could/would be valid...