并行循环多个数组

Question

我不知道我的代码出了什么问题。错误消息

 Package PGF Math Error: Unknown function `red' (in '{ red,green,blue,purple

编译此代码时发生：

\documentclass{article}

\usepackage{tikz}

%% defining parallel looping
\pgfset{
   foreach/parallel foreach/.style args={#1in#2via#3}{
       evaluate=#3 as #1 using {{#2}[#3-1]}
   },
}

\begin{document}

   %% defining three array's
   \newcommand{\myArrayI}{Marco,Andrea,Kiara,Carmen,Sebastian,Kurt}
   \newcommand{\myArrayII}{33,26,2,45,18,41}
   \newcommand{\myArrayIII}{red,green,blue,purple,yellow,black}

   %% parallel looping
   \foreach \ia [count=\cnt,
                 parallel foreach=\ib in \myArrayII  via \cnt,
                 parallel foreach=\ic in \myArrayIII via \cnt]  in \myArrayI
                 {
                  iteration \cnt: \ia, \ib, \ic   \\        
                 }
          
\end{document}

Answer 1

最后，我自己解决了这个问题。我只是在第三个数组中的每个元素周围添加了双引号，\myArrayIII如下所示。

\newcommand{\myArrayIII}{"red","green","blue","purple","yellow","black"}

并且它成功了。完整代码请见此处：

\documentclass{article}

\usepackage{tikz}

%% defining parallel looping
\pgfset{
   foreach/parallel foreach/.style args={#1in#2via#3}{
       evaluate=#3 as #1 using {{#2}[#3-1]}
   },
}

\begin{document}

   %% defining three array's
   \newcommand{\myArrayI}{Marco,Andrea,Kiara,Carmen,Sebastian,Kurt}
   \newcommand{\myArrayII}{33,26,2,45,18,41}
   \newcommand{\myArrayIII}{"red","green","blue","purple","yellow","black"}

   %% parallel looping
   \foreach \ia [count=\cnt,
                 parallel foreach=\ib in \myArrayII  via \cnt,
                 parallel foreach=\ic in \myArrayIII via \cnt]  in \myArrayI
                 {
                  iteration \cnt: \ia, \ib, \ic   \\        
                 }
          
\end{document}

输出：