我有两个列表x,y表示2D中的坐标.例如,x = [1,4,0.5,2,5,10,33,0.04],y = [2,5,44,0.33,2,14,20,0.03]. x [i]和y [i]表示2D中的一个点.现在我还有一个表示每个(x,y)点的“热”值的列表,例如z = [0.77,0.88,0.65,0.55,0.89,0.9,0.8,0.95].当然,x,y和z比实例高得多.
现在我想在2D中绘制热图,其中x和y表示轴坐标,z表示颜色.怎么能在python中完成?
解决方法:
此代码生成热图.有了更多的数据点,情节开始看起来非常好,我发现它一般非常快,即使是> 100k点.
import matplotlib.pyplot as plt
import matplotlib.tri as tri
import numpy as np
import math
x = [1,4,0.5,2,5,10,33,0.04]
y = [2,5,44,0.33,2,14,20,0.03]
z = [0.77, 0.88, 0.65, 0.55, 0.89, 0.9, 0.8, 0.95]
levels = [0.7, 0.75, 0.8, 0.85, 0.9]
plt.figure()
ax = plt.gca()
ax.set_aspect('equal')
CS = ax.tricontourf(x, y, z, levels, cmap=plt.get_cmap('jet'))
cbar = plt.colorbar(CS, ticks=np.sort(np.array(levels)),ax=ax, orientation='horizontal', shrink=.75, pad=.09, aspect=40,fraction=0.05)
cbar.ax.set_xticklabels(list(map(str,np.sort(np.array(levels))))) # horizontal colorbar
cbar.ax.tick_params(labelsize=8)
plt.title('Heat Map')
plt.xlabel('X Label')
plt.ylabel('Y Label')
plt.show()
生成此图片:
或者如果您正在寻找更渐进的颜色变化,请将tricontourf线更改为:
CS = ax.tricontourf(x, y, z, np.linspace(min(levels),max(levels),256), cmap=cmap)
然后情节将变为: