如何从计数器中减去一个数字并避免“包 pgf 错误：没有已知的名为...的形状”？

Question

MWE......

\documentclass{standalone}
\usepackage{tikz}
\begin{document}
  \begin{tikzpicture}
    \foreach \l [count=\i from 0] in {{Text 1}, {Text 2}, {Text 3}} {
      \ifnum\i<2
        \node [align=center, above] at (2*\i, 1.1) {\l};
      \else
        \node [align=center, above] at (3*(\i-1), 1.1) {\l};
      \fi
    }
  \end{tikzpicture}
\end{document}

... 导致错误Package pgf Error: No shape named 3*(2-1 is known。如何从计数器中减去一个数字？

Answer 1

问题在于括号。它们使解析器感到困惑。隐藏它们：

\documentclass{standalone}
\usepackage{tikz}
\begin{document}
  \begin{tikzpicture}
    \foreach \l [count=\i from 0] in {{Text 1}, {Text 2}, {Text 3}} {
      \ifnum\i<2
        \node [align=center, above] at (2*\i, 1.1) {\l};
      \else
        \node [align=center, above] at ({3*(\i-1)}, 1.1) {\l};
      \fi
    }
  \end{tikzpicture}
\end{document}