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我试图用定制的颜色图绘制0-69范围内的数据。下面是一个例子:Matplotlib:未对齐的颜色条刻度?
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.colors import LinearSegmentedColormap
colors = [(0.9, 0.9, 0.9), # Value = 0
(0.3, 0.3, 0.3), # Value = 9
(1.0, 0.4, 0.4), # Value = 10
(0.4, 0.0, 0.0), # Value = 19
(0.0, 0.7, 1.0), # Value = 20
(0.0, 0.1, 0.3), # Value = 29
(1.0, 1.0, 0.4), # Value = 30
(0.4, 0.4, 0.0), # Value = 39
(1.0, 0.4, 1.0), # Value = 40
(0.4, 0.0, 0.4), # Value = 49
(0.4, 1.0, 0.4), # Value = 50
(0.0, 0.4, 0.0), # Value = 59
(1.0, 0.3, 0.0), # Value = 60
(1.0, 0.8, 0.6)] # Value = 69
# Create the values specified above
max_val = 69
values = [n for n in range(max_val + 1) if n % 10 == 0 or n % 10 == 9]
# Create colormap, first normalise values
values = [v/float(max_val) for v in values]
values_and_colors = [(v, c) for v, c in zip(values, colors)]
cmap = LinearSegmentedColormap.from_list('my_cmap', values_and_colors,
N=max_val + 1)
# Create sample data in range 0-69
data = np.round(np.random.random((20, 20)) * max_val)
ax = plt.imshow(data, cmap=cmap, interpolation='nearest')
cb = plt.colorbar(ticks=range(0, max_val, 10))
plt.show()
我至于为什么颜色条蜱不与颜色梯度之间的不同分色排队迷惑不解(为其中有各10种颜色)。
我试着从[0,69]设置数据和观点区间为[0,70]:
cb.locator.axis.set_view_interval(0, 70)
cb.locator.axis.set_data_interval(0, 70)
cb.update_ticks()
但是这似乎并没有做任何事情。
请有人建议吗?