没有生成该图的单个数据数组。相反,许多用于绘图的数组是在克里金绘图函数内部生成的。
将填充轮廓更改为线条轮廓当然不是样式选项。因此需要使用原始绘图功能中的代码。
一个选项是子类kriging
化并实现自定义绘图函数(我们称之为myplot
)。在此功能中,可以使用contour
代替contourf
。当然,也可以完全根据自己的需要进行更改。
import pyKriging
from pyKriging.krige import kriging
from pyKriging.samplingplan import samplingplan
import numpy as np
import matplotlib.pyplot as plt
class MyKriging(kriging):
def __init__(self,*args,**kwargs):
kriging.__init__(self,*args,**kwargs)
def myplot(self,labels=False, show=True, **kwargs):
fig = plt.figure(figsize=(8,6))
# Create a set of data to plot
plotgrid = 61
x = np.linspace(self.normRange[0][0], self.normRange[0][1], num=plotgrid)
y = np.linspace(self.normRange[1][0], self.normRange[1][1], num=plotgrid)
X, Y = np.meshgrid(x, y)
# Predict based on the optimized results
zs = np.array([self.predict([xi,yi]) for xi,yi in zip(np.ravel(X), np.ravel(Y))])
Z = zs.reshape(X.shape)
#Calculate errors
zse = np.array([self.predict_var([xi,yi]) for xi,yi in zip(np.ravel(X), np.ravel(Y))])
Ze = zse.reshape(X.shape)
spx = (self.X[:,0] * (self.normRange[0][1] - self.normRange[0][0])) + self.normRange[0][0]
spy = (self.X[:,1] * (self.normRange[1][1] - self.normRange[1][0])) + self.normRange[1][0]
contour_levels = kwargs.get("levels", 25)
ax = fig.add_subplot(222)
CS = plt.contour(X,Y,Ze, contour_levels)
plt.colorbar()
plt.plot(spx, spy,'or')
ax = fig.add_subplot(221)
if self.testfunction:
# Setup the truth function
zt = self.testfunction( np.array(zip(np.ravel(X), np.ravel(Y))) )
ZT = zt.reshape(X.shape)
CS = plt.contour(X,Y,ZT,contour_levels ,colors='k',zorder=2, alpha=0)
if self.testfunction:
contour_levels = CS.levels
delta = np.abs(contour_levels[0]-contour_levels[1])
contour_levels = np.insert(contour_levels, 0, contour_levels[0]-delta)
contour_levels = np.append(contour_levels, contour_levels[-1]+delta)
CS = plt.contour(X,Y,Z,contour_levels,zorder=1)
plt.plot(spx, spy,'or', zorder=3)
plt.colorbar()
ax = fig.add_subplot(212, projection='3d')
ax.plot_surface(X, Y, Z, rstride=3, cstride=3, alpha=0.4)
if self.testfunction:
ax.plot_wireframe(X, Y, ZT, rstride=3, cstride=3)
if show:
plt.show()
sp = samplingplan(2)
X = sp.optimallhc(20)
testfun = pyKriging.testfunctions().branin
y = testfun(X)
k = MyKriging(X, y, testfunction=testfun, name='simple')
k.train()
k.myplot()