matplotlib的颜色图 [英] matplotlib's colormap

问题描述

我是python的新手，安装后，我已经完成了使用matplotlib绘制3d数据的工作.可悲的是，我唯一不知道如何完成的是颜色部分.我的图像仅显示表面，而根本不使用颜色条.这是我的代码.

I'm new to python and after installing it I've accomplished to plot my 3d data using matplotlib. Sadly the only thing I don't know how to get done is the color part. My image just shows the surface but doesn't use the color bar at all. Here is my code.

from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
from matplotlib.ticker import LinearLocator, FormatStrFormatter
import matplotlib.pyplot as plt
from matplotlib.mlab import griddata
import numpy as np

fig = plt.figure()
ax = fig.gca(projection='3d')

data = np.genfromtxt('Uizq.txt')
x = data[:,0]
y = data[:,1]
z = data[:,2]

xi = np.linspace(min(x), max(x))
yi = np.linspace(min(y), max(y))

ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('U')

X, Y = np.meshgrid(xi, yi)
Z = griddata(x, y, z, xi, yi)
ax.set_zlim3d(np.min(Z), np.max(Z))


surf = ax.plot_surface(X, Y, Z, rstride=2, cstride=2, cmap=cm.jet,
                   linewidth=0.5, antialiased=False)

fig.colorbar(surf, shrink=0.5, aspect=5)

plt.show()

您显然可以看到它全是蓝色，我想使用完整的 cm.jet 光谱将颜色与"U"相关联.这可能是一个非常白痴的问题，如果您翻了个白眼，请对不起.

you can obviously see that it is all blue, and I want to relate the color with "U" using the full cm.jet spectrum. This might be a very noob question, so sorry if you rolled your eyes.

推荐答案

添加行

surf.set_clim([np.min(Z),np.max(Z)])

在添加颜色栏之前.

3D绘图似乎没有考虑遮罩，因此您在数据中包含了 NaN ，这会混淆自动颜色限制.

It seems that the 3D plotting does not take into account the masking, so you are including NaN in the data, which confuses the automatic color limits.

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