連接兩個圓的yplot線

Question

我有一個從等值線圖中得到的x，y值的數組，我想繪製這些值。因爲它是圓圈內的圓形，pyplot在圓圈之間繪製任意線。有誰知道一種方法來刪除這條線？

我嘗試整理不起作用的點。我可以考慮刪除這條線的唯一方法是手動將這些值移動到一個新的數組中並分別繪製它們。不過，我有這些情況中的幾個，並且不希望篩選每個數據點。

#Plotted contours of a variable 
cs1 = ax1.contourf(x,z,refl0,clevs) 

#Get the contour lines for the 10th contour of the plot 
p1 = cs1.collections[10].get_paths()[0] 
v = p1.vertices 
x1=v[:,0] 
y1=v[:,1] 

#Plot the contour lines 
ax1 = plt.subplot(111) 
ax1.plot(x1,y1) 

這裏是一個通用的示例代碼

import numpy as np 
from matplotlib import pyplot as plt 

x= np.arange(-100,100,10) 
y= np.arange(-100,100,10) 

#Make a random circular function 
xi,yi = np.meshgrid(x,y) 
z= 2*xi +xi**2 -yi +yi**2 

#This is the contour plot of the data 
ax = plt.subplot(111) 
clevs = np.arange(-100,110,10)*100 
cs1 = ax.contourf(xi,yi,z,clevs) 
plt.show() 

#Get the contour lines for the 10th contour of the above plot 
p1 = cs1.collections[11].get_paths()[0] 
v = p1.vertices 
x1=v[:,0] 
y1=v[:,1] 

#Plot the contour lines 
ax1 = plt.subplot(111) 
ax1.plot(x1,y1) 
plt.show() 

Answer 1

如果目的是繪製兩個特定的輪廓線，你可以簡單地選擇有問題的水平，並做了contour情節他們：

import numpy as np 
from matplotlib import pyplot as plt 

x= np.arange(-100,100,10) 
y= np.arange(-100,100,10) 

#Make a random circular function 
xi,yi = np.meshgrid(x,y) 
z= 2*xi +xi**2 -yi +yi**2 

ax = plt.subplot(111) 
clevs = np.arange(-100,110,10)*100 
cs1 = ax.contourf(xi,yi,z,clevs) 

# chose level number 11 and 12 and draw them in black. 
cs2 = ax.contour(xi,yi,z,clevs[11:13], colors="k") 

plt.show()