标签matplotlib imshow轴与字符串

Question

我想通过plt.subplots创建多个imshows.每个imshow的轴应该用字符串标记,而不是用数字标记(这些是表示类别之间相关性的相关矩阵).

我从文档(非常底部)中找到了,它plt.yticks()返回了我想要的东西,但我似乎无法设置它们.也ax.yticks(...)行不通.

我找到了关于股票定位器和格式化程序的文档,但我不确定它是否或如何有用

A = np.random.random((3,3))
B = np.random.random((3,3))+1
C = np.random.random((3,3))+2
D = np.random.random((3,3))+3

lbls = ['la', 'le', 'li']

fig, axar = plt.subplots(2,2)
fig.subplots_adjust(right=0.8)
cbar_ax = fig.add_axes([0.85, 0.15, 0.05, 0.7])   

ar_plts = [A, B, C, D]

for i,ax in enumerate(axar.flat):
    im = ax.imshow(ar_plts[i]
                    , interpolation='nearest'
                    , origin='lower')
    ax.grid(False)
    plt.yticks(np.arange(len(lbls)), lbls)

fig.colorbar(im, cax=cbar_ax)

fig_path = r"blah/blub"
fig_name = "matrices.png"
fig_fobj = os.path.join(fig_path, fig_name)
fig.savefig(fig_fobj)

Answer 1

您可以使用plt.xticks或更改数字ax.set_xticks(y表示相同),但这不允许您更改刻度线的标签.为此你需要ax.set_xticklabels(对y来说也一样).这段代码对我有用

A = np.random.random((3,3))
B = np.random.random((3,3))+1
C = np.random.random((3,3))+2
D = np.random.random((3,3))+3

lbls = ['la', 'le', 'li']

fig, axar = plt.subplots(2,2)
fig.subplots_adjust(right=0.8)
cbar_ax = fig.add_axes([0.85, 0.15, 0.05, 0.7])   

ar_plts = [A, B, C, D]

for i,ax in enumerate(axar.flat):
    im = ax.imshow(ar_plts[i]
                    , interpolation='nearest'
                    , origin='lower')
    ax.grid(False)
    ax.set_yticks([0,1,2])
    ax.set_xticks([0,1,2])

    ax.set_xticklabels(lbls)
    ax.set_yticklabels(lbls)

fig.colorbar(im, cax=cbar_ax)

fig_path = r"blah/blub"
fig_name = "matrices.png"
fig_fobj = os.path.join(fig_path, fig_name)
fig.savefig(fig_fobj)

对于多个绘图,您需要小心使用颜色条.它仅为您的上一个情节提供正确的值.如果它对于您需要使用的所有图都应该是正确的

im = ax.imshow(ar_plts[i],
             interpolation='nearest',
             origin='lower',
             vmin=0.0,vmax=1.0)

我假设你的数据中最小的值是0.0最大的1.0.