Grid Manager¶

matplotlib.pyplot.subplot¶

Manual Plotting¶

In [271]:

fig = plt.figure()
fig.add_axes([0,0,1,1])
ax1 = fig.add_axes([0.1, 0.5, 0.8, 0.4],
                   xticklabels=[], ylim=(-1.2, 1.2))
ax2 = fig.add_axes([0.1, 0.1, 0.8, 0.4],
                   ylim=(-1.2, 1.2))

In [272]:

fig = plt.figure()
ax1 = fig.add_axes([0.1, 0.5, 0.8, 0.4],
                   xticklabels=[], ylim=(-1.2, 1.2))
ax2 = fig.add_axes([0.1, 0.1, 0.8, 0.4],
                   ylim=(-1.2, 1.2))

x = np.linspace(0, 10)
ax1.plot(np.sin(x))
ax2.plot(np.cos(x));

In [273]:

ax1 = plt.axes()  # standard axes
ax2 = plt.axes([0.65, 0.65, 0.2, 0.2])

Create Subplot Individually¶

Each call lto subplot() will create a new container for subsequent plot command

In [274]:

plt.subplot(2,4,1)
plt.text(0.5, 0.5, 'one',fontsize=18, ha='center')

plt.subplot(2,4,8)
plt.text(0.5, 0.5, 'eight',fontsize=18, ha='center')

Out[274]:

Text(0.5,0.5,'eight')

In [275]:

for i in range(1, 7):
    plt.subplot(2, 3, i)
    plt.text(0.5, 0.5, str((2, 3, i)),
             fontsize=18, ha='center')

Create Subplots Upfront¶

subplots() returns two variables:

• fig : reference to the entire container
• ax : reference to individual plot. It is an array

In [276]:

fig, ax = plt.subplots(2, 3) # individual axes

In [277]:

fig, ax = plt.subplots(2, 3, sharex='col', sharey='row') # removed inner label

Iterate through subplots (ax) to populate them

In [278]:

fig, ax = plt.subplots(2, 3, sharex='col', sharey='row')
for i in range(2):
    for j in range(3):
        ax[i, j].text(0.5, 0.5, str((i, j)),
                      fontsize=18, ha='center')

Complicated Arrangement¶

In [279]:

plt.figure(figsize=(5,5))
grid = plt.GridSpec(2, 3, hspace=0.4, wspace=0.4)
plt.subplot(grid[0, 0])  #row 0, col 0
plt.subplot(grid[0, 1:]) #row 0, col 1 to :
plt.subplot(grid[1, :2]) #row 1, col 0:2 
plt.subplot(grid[1, 2])  #ro2 1, col 2

Out[279]:

<matplotlib.axes._subplots.AxesSubplot at 0x2c31a70f5f8>

In [280]:

plt.figure(figsize=(5,5))
grid = plt.GridSpec(4, 4, hspace=0.4, wspace=0.4)
plt.subplot(grid[:3, 0])    # row 0:3, col 0
plt.subplot(grid[:3, 1: ])  # row 0:3, col 1:
plt.subplot(grid[3, 1: ]);   # row 3,   col 1:

-1 means last row or column

In [281]:

plt.figure(figsize=(6,6))
grid = plt.GridSpec(4, 4, hspace=0.4, wspace=1.2)
plt.subplot(grid[:-1, 0 ])  # row 0 till last row (not including last row), col 0
plt.subplot(grid[:-1, 1:])  # row 0 till last row (not including last row), col 1 till end
plt.subplot(grid[-1, 1: ]); # row last row, col 1 till end