I have plotted a contour line of a specific level for three different parameters namely |G|, 1-Cn/C and VgN/c and want to save the x and y coordinates of the contour line that is common to all three contour lines. I want to store the x and y coordinates in a .txt file. I can store the points for specific contour lines of a single contour plot but am not able to get the point that is common to all the three contour lines of different plots. Used this to get the x and y coordinates of a contour line https://stackoverflow.com/a/25208345/16319933
khmax = np.arange(0,np.pi,0.01)
Ncmax = np.arange(0,np.pi,0.01)
[X, Y] = np.meshgrid(Ncmax,khmax)
fig, ax = plt.subplots()
mod_G = (((G_real)**2) + ((G_imag)**2))**(0.5)
line_colours = ['blue']
contour = plt.contour(X,Y,mod_G,levels = [1.000000000],colors = line_colours)
ax.set_title('magnitude of G')
ax.set_xlabel('Ncmax')
ax.set_ylabel('khmax')
ax.clabel(contour, inline= True,inline_spacing = -1,fmt = '%.9f',fontsize=9)
plt.xlim(0, np.pi)
plt.ylim(0, np.pi)
plt.show()
beta = np.arctan(-((G_imag) / (G_real)))
phase_speed = 1-(beta /(X * Y))
ax.set_title('magnitude of 1-Cnum / C')
ax.set_xlabel('Ncmax')
ax.set_ylabel('khmax')
contour = plt.contour(X,Y,phase_speed,levels = [0.0],colors = 'black')
ax.clabel(contour, inline= True,inline_spacing = -2, fontsize=8)
plt.show()
contour = plt.contour(X,Y,VgN,levels = [1.0])
ax.set_title('magnitude of VgN/c')
ax.set_xlabel('Ncmax')
ax.set_ylabel('khmax')
ax.clabel(contour, inline= True, inline_spacing = -1,fmt = '%1.8f',fontsize=8)
plt.show()
For example, I have these graphs:
