matplotlib中pl.cm.Spectral的pyplot等效项

Question

我一直在使用pylab中的代码，它工作得很好：

import pylab as pl
colors = pl.cm.Spectral(np.linspace(0, 1, 10))

然而，我想离开pylab，因为在文档中它说“pyplot接口通常是非交互式绘图的首选”。所以我试着使用matplotlib.cm，但是找不到对应的东西。有人能帮我这个忙吗？

谢谢!

Answer 1

在脚本中使用matplotlib的最常见方法是

import matplotlib.pyplot as plt

在那里，您可以使用plt.cm.Spectral或通过方便的函数plt.get_cmap访问Spectral色彩映射表。例如,

colors = plt.cm.Spectral(np.linspace(0, 1, 10))

或

colors = plt.get_cmap('Spectral')(np.linspace(0, 1, 10))

等同于

colors = pl.cm.Spectral(np.linspace(0, 1, 10))

Answer 2

应该只是cm.Spectral

In [123]:

import matplotlib.cm as cm
cm.Spectral(np.linspace(0,1,10))
Out[123]:
array([[ 0.61960787,  0.00392157,  0.25882354,  1.        ],
       [ 0.84721262,  0.26120723,  0.30519032,  1.        ],
       [ 0.96378316,  0.47743176,  0.28581316,  1.        ],
       [ 0.99346405,  0.74771243,  0.43529413,  1.        ],
       [ 0.99777009,  0.93087275,  0.63306423,  1.        ],
       [ 0.94425221,  0.97770089,  0.66205308,  1.        ],
       [ 0.74771243,  0.89803922,  0.627451  ,  1.        ],
       [ 0.45305653,  0.78154557,  0.64628991,  1.        ],
       [ 0.21607075,  0.55563248,  0.73194927,  1.        ],
       [ 0.36862746,  0.30980393,  0.63529414,  1.        ]])
In [119]:

import pylab as pl
pl.cm.Spectral(np.linspace(0, 1, 10))
Out[119]:
array([[ 0.61960787,  0.00392157,  0.25882354,  1.        ],
       [ 0.84721262,  0.26120723,  0.30519032,  1.        ],
       [ 0.96378316,  0.47743176,  0.28581316,  1.        ],
       [ 0.99346405,  0.74771243,  0.43529413,  1.        ],
       [ 0.99777009,  0.93087275,  0.63306423,  1.        ],
       [ 0.94425221,  0.97770089,  0.66205308,  1.        ],
       [ 0.74771243,  0.89803922,  0.627451  ,  1.        ],
       [ 0.45305653,  0.78154557,  0.64628991,  1.        ],
       [ 0.21607075,  0.55563248,  0.73194927,  1.        ],
       [ 0.36862746,  0.30980393,  0.63529414,  1.        ]])

Answer 3

import matplotlib.pyplot as plt

colors = plt.get_cmap('Spectral')(np.linspace(0, 1, 10))

是目前唯一有效的解决方案。

matplotlib要使用的删除选项：

colors = plt.cm.Spectral(np.linspace(0, 1, 10))

在最新版本中。