Python 子图的pyplot绘制方法

Python 子图的pyplot绘制方法,python,matplotlib,iteration,subplot,Python,Matplotlib,Iteration,Subplot,我有10个数字0-9的图像,每个图像包含28x28个像素,在一个数组X中,形状(28**2,10) 我正在用循环中的新像素更新X,我想在每次迭代时更新我的绘图 目前,我的代码将创建100个单独的数字 def plot_output(X): """grayscale images of the digits 0-9 in 28x28 pixels in pyplot Input, X is of shape (28^2, 10) """ n = X.sha

我有10个数字0-9的图像,每个图像包含28x28个像素,在一个数组
X
中,形状
(28**2,10)

我正在用循环中的新像素更新
X
,我想在每次迭代时更新我的绘图

目前,我的代码将创建100个单独的数字

def plot_output(X):
    """grayscale images of the digits 0-9
    in 28x28 pixels in pyplot

    Input, X is of shape (28^2, 10)
    """
    n = X.shape[1] # number of digits
    pixels = (28,28) # pixel shape
    fig, ax = plt.subplots(1,n)

    # cycle through digits from 0-9
    # X input array is reshaped for each 10 digits
    # to a (28,28) vector to plot
    for i in range(n):
        wi=X[:,i] # w = weights for digit

        wi=wi.reshape(*pixels)
        ax[i].imshow(wi,cmap=plt.cm.gist_gray,
            interpolation='gaussian', aspect='equal')
        ax[i].axis('off')
        ax[i].set_title('{0:0d}'.format(i))

    plt.tick_params(axis='x', which='both', bottom='off',
        top='off', labelbottom='off')

    plt.show()

for i in range(100):
    X = init_pix() # anything that generates a (728, 10) array
    plot_output(X)
我试过使用
plt.draw()
pt.canvas.draw()
,但似乎无法正确实现它。我还尝试了
plt.clf()
,但对我来说也不起作用

我可以使用线条和一个轴来完成这项工作,但我无法让它在子批次上工作。

使用
plt.ion()
可以生成
plt.show()
命令,通常是阻塞,而不是阻塞

然后,您可以使用
imshow
更新轴,它们将在计算时显示在您的图形中

例如:

import numpy as np
import matplotlib.pyplot as plt

n=10

X = np.random.rand(28**2,n)

fig, ax = plt.subplots(1,n)

plt.ion()
plt.show()

for i in range(n):
    wi = X[:,1].reshape(28,28)
    ax[i].imshow(wi)

    #fig.canvas.draw()  # May be necessary, wasn't for me.

plt.ioff()  # Make sure to make plt.show() blocking again, otherwise it'll run
plt.show()  #   right through this and immediately close the window (if program exits)

现在,在定义轴之前,您将得到丑陋的巨大的空白色轴,但这应该可以让您开始了。

我找到了一个解决方案,创建了一个plot类,在每个轴上使用
.cla()
,然后使用
imshow()重新定义每个轴。


谢谢这很有效,我用
plt.ion()
将这个答案合并到我的答案中。我没有发现我必须打开和关闭交互模式though@alexmcf抱歉不清楚,这实际上就是我所说的打开交互模式的意思
ion
大概代表交互式模式ON(请注意粗体)。如果在循环后不必关闭If,这很有趣,因为在我的测试中,如果我不关闭它,最终的
plt.show()
将不会阻塞,程序将继续,当它结束时,绘图将自动关闭。谢谢,这是我需要的提示:)对我来说
fig.canvas.draw()
是必要的。
class plot_output(object):

    def __init__(self, X):
        """grayscale images of the digits 1-9
        """
        self.X = X
        self.n = X.shape[1] # number of digits
        self.pixels = (25,25) # pixel shape
        self.fig, self.ax = plt.subplots(1,self.n)
        plt.ion()

        # cycle through digits from 0-9
        # X input vector is reshaped for each 10 digits
        # to a (28,28) vector to plot
        self.img_obj_ar = []

        for i in range(self.n):
            wi=X[:,i] # w = weights for digit

            wi=wi.reshape(*self.pixels)
            self.ax[i].imshow(wi,cmap=plt.cm.gist_gray,
                interpolation='gaussian', aspect='equal')
            self.ax[i].axis('off')
            self.ax[i].set_title('{0:0d}'.format(i))

        plt.tick_params(\
            axis='x',          # changes apply to the x-axis
            which='both',      # both major and minor ticks are affected
            bottom='off',      # ticks along the bottom edge are off
            top='off',         # ticks along the top edge are off
            labelbottom='off')

        plt.tick_params(\
            axis='y',          # changes apply to the y-axis
            which='both',      # both major and minor ticks are affected
            left='off', 
            right='off',    # ticks along the top edge are off
            labelleft='off')

        plt.show()

    def update(self, X):

        # cycle through digits from 0-9
        # X input vector is reshaped for each 10 digits
        # to a (28,28) vector to plot
        for i in range(self.n):
            self.ax[i].cla()
            wi=X[:,i] # w = weights for digit

            wi=wi.reshape(*self.pixels)
            self.ax[i].imshow(wi,cmap=plt.cm.gist_gray,
                            interpolation='gaussian', aspect='equal')
            self.ax[i].axis('off')
            self.ax[i].set_title('{0:0d}'.format(i))

        plt.draw()