matplotlib colorbar in each subplot

Question

I would like to add a separate colorbar to each subplot in a 2x2 plot   fig      ax1 ax2     ax3 ax4     plt subplots 2  2 sharex   True sharey True  z1 plot   ax1 scatter x y c   z1 vmin 0 0 vmax 0 4  plt colorbar z1 plot cax ax1  z2 plot   ax2 scatter x y c   z2 vmin 0 0 vmax 40  plt colorbar z1 plot cax ax2  z3 plot   ax3 scatter x y c   z3 vmin 0 0 vmax 894  plt colorbar z1 plot cax ax3  z4 plot   ax4 scatter x y c   z4 vmin 0 0 vmax 234324  plt colorbar z1 plot cax ax4  plt show     I thought that this is how you do it  but the resulting plot is really messed up  it just has an all grey background and ignores the set xlim   set ylim commands I have  not shown here for simplicity     it shows no color bars  Is this the right way to do it   I also tried getting rid of the  cax         but then the colorbar all goes on the bottom right plot and not to each separate plot

User · Answer

This can be easily solved with the the utility make_axes_locatable. I provide a minimal example that shows how this works and should be readily adaptable:

import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import make_axes_locatable

import numpy as np

m1 = np.random.rand(3, 3)
m2 = np.arange(0, 3*3, 1).reshape((3, 3))

fig = plt.figure(figsize=(16, 12))
ax1 = fig.add_subplot(121)
im1 = ax1.imshow(m1, interpolation='None')

divider = make_axes_locatable(ax1)
cax = divider.append_axes('right', size='5%', pad=0.05)
fig.colorbar(im1, cax=cax, orientation='vertical')

ax2 = fig.add_subplot(122)
im2 = ax2.imshow(m2, interpolation='None')

divider = make_axes_locatable(ax2)
cax = divider.append_axes('right', size='5%', pad=0.05)
fig.colorbar(im2, cax=cax, orientation='vertical');

User · Answer

Please have a look at this matplotlib example page  There it is shown how to get the following plot with four individual colorbars for each subplot    I hope this helps  You can further have a look here  where you can find a lot of what you can do with matplotlib

User · Answer

In plt colorbar z1 plot cax ax1   use ax  instead of cax   i e  plt colorbar z1 plot ax ax1

User · Answer

Try to use the func below to add colorbar   def add colorbar mappable       from mpl toolkits axes grid1 import make axes locatable     import matplotlib pyplot as plt     last axes   plt gca       ax   mappable axes     fig   ax figure     divider   make axes locatable ax      cax   divider append axes  right   size  5    pad 0 05      cbar   fig colorbar mappable  cax cax      plt sca last axes      return cbar   Then you codes need to be modified as   fig      ax1 ax2     ax3 ax4     plt subplots 2  2 sharex   True sharey True  z1 plot   ax1 scatter x y c   z1 vmin 0 0 vmax 0 4  add colorbar z1 plot

User · Answer

Specify the ax argument to matplotlib pyplot colorbar    e g  import numpy as np import matplotlib pyplot as plt  fig  ax   plt subplots 2  2  for i in range 2       for j in range 2            data   np array   i  j    i 0 5  j 0 5             im   ax i  j  imshow data           plt colorbar im  ax ax i  j    plt show

[python] matplotlib colorbar in each subplot

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