LaTeX无法处理matplotlib文本

Question

I've been having this trouble for a long time whenever I want to render LaTeX for plot labelling and text, it works sometimes for some symbols but not others. For example in my script shown here generates the plot below:

from matplotlib import rc
plt.rc('text', usetex=True)
plt.plot(a_t,asol[:,0],label ='$\psi$')
plt.plot(a_t,rho,label ="$\rho/\rho_c$")
plt.xlabel(r"$\xi$",fontsize=15)
from matplotlib.legend_handler import HandlerLine2D
plt.legend(loc='upper left',prop={'size':12},numpoints=1)

I've tried other symbols, $\\pi$ works okay but $\\theta$ only shows "heta" without the t. I'm confused by why some symbols works for LaTeX and some don't.

Thanks!

Answer 1

Remember that certain characters in Python strings have special meanings, eg \\r for carriage return, \\t for tab. That's why you're only getting the strange results some of the time, since \\p doesn't have a special meaning. So either make sure your backslashes are treated as literal backslashes by escaping them:

plt.plot(a_t,rho,label = "$\\rho/\\rho_c$")

Or use raw strings:

plt.plot(a_t,rho,label = r"$\rho/\rho_c$")