How do I get multiple subplots in matplotlib

Question

I am a little confused about how this code works   fig  axes   plt subplots nrows 2  ncols 2  plt show     How does the fig  axes work in this case  What does it do   Also why wouldn t this work to do the same thing   fig   plt figure   axes   fig subplots nrows 2  ncols 2

User · Answer

Iterating through all subplots sequentially:

fig, axes = plt.subplots(nrows, ncols)

for ax in axes.flatten():
    ax.plot(x,y)

Accessing a specific index:

for row in range(nrows):
    for col in range(ncols):
        axes[row,col].plot(x[row], y[col])

User · Answer

You might be interested in the fact that as of matplotlib version 2 1 the second code from the question works fine as well    From the change log      Figure class now has subplots method   The Figure class now has a subplots   method which behaves the same as pyplot subplots   but on an existing figure    Example   import matplotlib pyplot as plt  fig   plt figure   axes   fig subplots nrows 2  ncols 2   plt show

User · Answer

There are several ways to do it  The subplots method creates the figure along with the subplots that are then stored in the ax array  For example   import matplotlib pyplot as plt  x   range 10  y   range 10   fig  ax   plt subplots nrows 2  ncols 2   for row in ax      for col in row          col plot x  y   plt show       However  something like this will also work  it s not so  clean  though since you are creating a figure with subplots and then add on top of them   fig   plt figure    plt subplot 2  2  1  plt plot x  y   plt subplot 2  2  2  plt plot x  y   plt subplot 2  2  3  plt plot x  y   plt subplot 2  2  4  plt plot x  y   plt show

User · Answer

read the documentation  matplotlib pyplot subplots  pyplot subplots   returns a tuple fig  ax which is unpacked in two variables using the notation  fig  axes   plt subplots nrows 2  ncols 2    the code  fig   plt figure   axes   fig subplots nrows 2  ncols 2    does not work because subplots  is a function in pyplot not a member of the object Figure

User · Answer

You can also unpack the axes in the subplots call And set whether you want to share the x and y axes between the subplots   Like this   import matplotlib pyplot as plt fig    ax1  ax2    ax3  ax4     plt subplots nrows 2  ncols 2  sharex True  sharey True  ax1 plot range 10    r   ax2 plot range 10    b   ax3 plot range 10    g   ax4 plot range 10    k   plt show

User · Answer

Go with the following if you really want to use a loop  Nobody has actually answered how to feed data in a loop  def plot data       fig   plt figure figsize  100  100       for idx  k in enumerate data keys    1           x  y   data k  keys    data k  values         plt subplot 63  10  idx          plt bar x  y        plt show

User · Answer

import matplotlib pyplot as plt  fig  ax   plt subplots 2  2   ax 0  0  plot range 10    r    row 0  col 0 ax 1  0  plot range 10    b    row 1  col 0 ax 0  1  plot range 10    g    row 0  col 1 ax 1  1  plot range 10    k    row 1  col 1 plt show

[python] How do I get multiple subplots in matplotlib?

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