Pgf-fpu 库问题

Question

也许是一个众所周知的问题，如何避免0整数的尾随无用？

\documentclass{article}

\usepackage{tikz}
\usepgflibrary{fpu}

\begin{document}

\foreach \n [evaluate=\n as \m using int(\n+1)] in {1,...,3} {\m\ }

\pgfkeys{/pgf/fpu=true,/pgf/fpu/output format=fixed}

\foreach \n [evaluate=\n as \m using int(\n+1)] in {1,...,3} {\m\ }
\end{document} 

Answer 1

你可以\m输入\pgfmathprintnumber。

\documentclass{article}

\usepackage{tikz}
\usepgflibrary{fpu}

\begin{document}

\foreach \n [evaluate=\n as \m using int(\n+1)] in {1,...,3} {\m\ }

\pgfkeys{/pgf/fpu=true,/pgf/fpu/output format=fixed}

\foreach \n [evaluate=\n as \m using int(\n+1)] in {1,...,3} {\pgfmathprintnumber{\m}\ }
\end{document}

Answer 2

更简单的语法：

\documentclass{article}
\usepackage{xparse,xfp}

\ExplSyntaxOn
\NewDocumentCommand{\xforeach}{mO{1}mm}
 {
  \int_step_inline:nnnn { #1 } { #2 } { #3 } { #4 }
 }
\ExplSyntaxOff

\begin{document}

\xforeach{1}{3}{#1 }

\xforeach{1}{3}{\inteval{#1+1} }

\xforeach{1}{3}{\fpeval{round(sqrt(#1),4)} }

\end{document}

可选参数是步骤，你可以尝试\xforeach{1}[2]{5}{#1 }。你也可以传递\fpeval给\numof siunitx。例如，

\xforeach{1}[3]{7}{\fpeval{round(pi^(#1),3)} }

将产生