python子图for循环

Question

我试图使用for来填充一个子图，但我做不到。下面是我的代码摘要:编辑1：

for idx in range(8):
  img = f[img_set[ind[idx]][0]]
  patch = img[:,col1+1:col2, row1+1:row2]
  if idx < 3:
        axarr[0,idx] = plt.imshow(patch)
    elif idx <6:
        axarr[1,idx-3] = plt.imshow(patch)
    else:
        axarr[2,idx-6] = plt.imshow(patch)
path_ = 'plots/test' + str(k) + '.pdf'
fig.savefig(path_)

它只在第3行和第3列上绘制图像，其余部分为空白。我怎么才能改变呢？

Answer 1

你忘了创建子情节了。您可以使用add_subplot() (subplot)。例如,

import matplotlib.pyplot as plt

fig = plt.figure()

for idx in xrange(9):
    ax = fig.add_subplot(3, 3, idx+1) # this line adds sub-axes
    ...
    ax.imshow(patch) # this line creates the image using the pre-defined sub axes

fig.savefig('test.png')

在您的示例中，它可能类似于：

import matplotlib.pyplot as plt

fig = plt.figure()

for idx in xrange(8):
    ax = fig.add_subplot(3, 3, idx+1)
    img = f[img_set[ind[idx]][0]]
    patch = img[:,col1+1:col2, row1+1:row2]
    ax.imshow(patch)

path_ = 'plots/test' + str(k) + '.pdf'        
fig.savefig(path_)