在matplotlib文本框中对齐LaTeX数学文本 [英] Align LaTeX math text in matplotlib text box

问题描述

我正在尝试生成一个文本框，其中的LaTeX代码行在matplotlib框架中正确对齐.我尝试使用格式对齐方法(即{:<11})，但在数学模式下似乎不起作用.

I'm trying to generate a text box with lines of LaTeX code correctly aligned in a matplotlib frame. I tried using the format alignment method (ie: {:<11}) but it does not seem to work on math mode.

这是我得到的输出:

其中=符号应都在右侧对齐(请参见下面的MWE).

where the = symbols should all be aligned to the right (see MWE below).

如何生成这样的文本框，其=符号正确对齐?

How can I produce such a text box with the = signs correctly aligned?

MWE :

(不要介意怪异的数字比例和文本框放置，这是我裁剪生成此MWE的更大代码的一部分)

(Never mind the weird figure proportions and text box placing, this is part of a much larger code which I cropped to generate this MWE)

import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
import matplotlib.offsetbox as offsetbox

# Figure top-level container. Weird size is because
# this is part of a larger code.
fig = plt.figure(figsize=(30, 25))
gs = gridspec.GridSpec(10, 12)
ax_t = plt.subplot(gs[4:6, 10:12])

# Some mock values.
cp_r = [0.001, 8.3, 0.18, 15.2, 5000, 0.3]
cp_e = [0.0005, 0.2, 0.11, 0.3, 200, 0.1]

# Remove axis from frame.
ax_t.axis('off')

# Text lines.
text2 = r'{:<11}'.format('$y$') + \
    r'$=\, {} \pm {}$'.format(cp_r[0], cp_e[0])
text3 = r'{:<11}'.format('$log(ret)$') + \
    r'$=\, {} \pm {}$'.format(cp_r[1], cp_e[1])
text4 = r'{:<11}'.format('$A_{{(B-C)}}$') + \
    r'$=\, {} \pm {}$'.format(cp_r[2], cp_e[2])
text5 = r'{:<11}'.format('$(n-N)_o$') + \
    r'$=\, {} \pm {}$'.format(cp_r[3], cp_e[3])
text6 = r'{:<11}'.format('$K_{{\odot}}$') + \
    r'$=\, {} \pm {}$'.format(cp_r[4], cp_e[4])
text7 = r'{:<11}'.format('$d_{{frac}}$') + \
    r'$=\, {} \pm {}$'.format(cp_r[5], cp_e[5])
text = text2 + '\n' + text3 + '\n' + text4 + '\n' + text5 + '\n' + text6 + \
    '\n' + text7

# Draw text box.
ob = offsetbox.AnchoredText(text, pad=1, loc=6, prop=dict(size=13))
ob.patch.set(alpha=0.85)
ax_t.add_artist(ob)

plt.savefig('out.png', dpi=300)

推荐答案

您可以按照

---

使用align环境的替代解决方案:

---

Alternative solution using align environment:

import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
import matplotlib.offsetbox as offsetbox
custom_preamble = {
    "text.usetex": True,
    "text.latex.preamble": [
        r"\usepackage{amsmath}", # for the align enivironment
        ],
    }
plt.rcParams.update(custom_preamble)

# Figure top-level container. Weird size is because
# this is part of a larger code.
fig = plt.figure(figsize=(30, 25))
gs = gridspec.GridSpec(10, 12)
ax_t = plt.subplot(gs[4:6, 10:12])

# Some mock values.
cp_r = [0.001, 8.3, 0.18, 15.2, 5000, 0.3]
cp_e = [0.0005, 0.2, 0.11, 0.3, 200, 0.1]

# Remove axis from frame.
ax_t.axis('off')

# Text lines.
text1 = r'\begin{align*} '
text2 = r'y &= ' + str(cp_r[0]) + '\pm ' + str(cp_e[0]) + '\\\\'
text3 = r'\log(ret) &= ' + str(cp_r[1]) + '\pm ' + str(cp_e[1]) + '\\\\'
text4 = r'A_{{(B-C)}} &= ' + str(cp_r[2]) + '\pm ' + str(cp_e[2]) + '\\\\'
text5 = r'(n-N)_o &= ' + str(cp_r[3]) + '\pm ' + str(cp_e[3]) + '\\\\'
text6 = r'K_{{\odot}} &= ' + str(cp_r[4]) + '\pm ' + str(cp_e[4]) + '\\\\'
text7 = r'd_{{frac}} &= ' + str(cp_r[5]) + '\pm ' + str(cp_e[5])
text8 = r'\end{align*}'
text = text1 + text2 + text3 + text4 + text5 + text6 + text7 + text8

# Draw text box.
ob = offsetbox.AnchoredText(text, pad=1, loc=6, prop=dict(size=13))
ob.patch.set(alpha=0.85)
ax_t.add_artist(ob)

plt.savefig('out.png', dpi=300)

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