为什么我不能在 tikzmath 的 for 循环中使用变量？

Question

我正在尝试使用以下代码绘制一批圆圈。但是，我无法创建我想要的图形。并且我收到一条错误消息undefined control sequence. argument 0,...,\NY。但如果我将其更改\NY为4。它就可以正常工作。为什么我不能使用 \NY 呢{0,...,\NY}？

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,arrows}
\usetikzlibrary{math}
\usetikzlibrary{positioning,calc}

\begin{document}
\begin{tikzpicture}
  \tikzmath{
    \VX = 30;
    \VY = 30;
    int \NX = 6;
    int \NY = 4;
    int \nix; int \niy;
    \OX = 0; \OY = 0;
    for \niy in {0,...,\NY}{%
      for \nix in {0,...,6}{%
        {\node [circle, draw = red, minimum size = \VX pt] at (\nix*\VX pt,\niy*\VY pt) {};};
      };
    };
  };
\end{tikzpicture}
\end{document}

Answer 1

像

int \NY = 4;

不允许。使用

int \NY; \NY = 4;

相反，你的 MWE 将会起作用：

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,arrows}
\usetikzlibrary{math}
\usetikzlibrary{positioning,calc}

\begin{document}
\begin{tikzpicture}
  \tikzmath{
    \VX = 30;
    \VY = 30;
    int \NX; \NX = 6;
    int \NY; \NY = 4;
    int \nix; int \niy;
    \OX = 0; \OY = 0;
    for \niy in {0,...,\NY}{%
      for \nix in {0,...,\NX}{%
        {\node [circle, draw = red, minimum size = \VX pt] at (\nix*\VX pt,\niy*\VY pt) {};};
      };
    };
  };
\end{tikzpicture}
\end{document} 

Answer 2

或者，您可以\newcommand\NX{6} \newcommand\NY{4}在序言中使用它们，然后也可以在循环中使用它们。

梅威瑟：

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,arrows}
\usetikzlibrary{math}
\usetikzlibrary{positioning,calc}
\newcommand\NX{6}
\newcommand\NY{4}
\begin{document}
\begin{tikzpicture}
  \tikzmath{
    \VX = 30;
    \VY = 30;
    int \nix; int \niy;
    \OX = 0; \OY = 0;
    for \niy in {0,...,\NY}{%
      for \nix in {0,...,\NX}{%
        {\node [circle, draw = red, minimum size = \VX pt] at (\nix*\VX pt,\niy*\VY pt) {};};
      };
    };
  };
\end{tikzpicture}
\end{document}