為什麼我不能在 tikzmath 的 for 迴圈中使用變數？

Question

我正在嘗試使用以下程式碼繪製一批圓圈。然而，我沒能創造出我想要的圖形。我收到一個錯誤說undefined control sequence. argument 0,...,\NY.但如果我\NY改為4.效果很好。為什麼我不能在 中使用 \NY {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;

不允許。使用

int \NY; \NY = 4;

相反，您的 MWE 將起作用：

\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}在序言中使用它們，然後也可以在循環中使用它們。

微量元素：

\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}