强制字符的水平间距

Question

如何强制字符间距？
我尝试使用零宽度框，但其内容会向左移动（不确定原因）。

\documentclass{minimal}\usepackage{fancyvrb}\textwidth=9cm
\begin{document}
\begin{Verbatim}[commandchars=\\\{\}, codes={\catcode`$=3\catcode`^=7}]
L = F(x, y)         % align to this
$\mathcal{L}$ = F(x, y).mean()  % $\mathcal{L}$ takes too much space
\makebox[0pt]{$\mathcal{L}$}  = F(x, y).mean()  % the zero box shifts left
\end{Verbatim}
\end{document}

Answer 1

您想要一个左对齐的 makebox（不居中）

\documentclass{minimal}\usepackage{fancyvrb}\textwidth=9cm
\begin{document}
\begin{Verbatim}[commandchars=\\\{\}, codes={\catcode`$=3\catcode`^=7}]
L = F(x, y)         % align to this
\makebox[0pt][l]{$\mathcal{L}$}  = F(x, y).mean()  % the zero box shifts left
\end{Verbatim}
\end{document}

Answer 2

我更喜欢将字母空间居中（0.5em），但我还建议水平缩放符号。

\documentclass{article}
\usepackage{fancyvrb}
\usepackage{graphicx}

\makeatletter
\newcommand{\tcal}[1]{%
  \sbox0{$\m@th\mathcal{#1}$}%
  \scalebox{\fpeval{(0.5em)/(\wd0)}}[1]{\usebox0}%
}
\makeatother
\newcommand{\lcal}[1]{\makebox[0.5em][l]{$\mathcal{#1}$}}
\newcommand{\ccal}[1]{\makebox[0.5em]{$\mathcal{#1}$}}

\begin{document}

\begin{Verbatim}[commandchars=\\\{\}]
L = F(x, y)
\tcal{L} = F(x, y).mean()
\lcal{L} = F(x, y).mean()
\ccal{L} = F(x, y).mean()
\tcal{L}(x)+\tcal{Q}+x
\lcal{L}(x)+\lcal{Q}+y
\ccal{L}(x)+\ccal{Q}+z
\end{Verbatim}

\end{document}

比较输出并做出决定。