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\ifnum#1=0.09\relax 有什么问题？

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\ifnum#1=0.09\relax 有什么问题？

以下代码无法编译，并出现以下错误消息

缺失=插入\ifnum

\documentclass[pstricks,border=4pt]{standalone}
\usepackage{multido}

\psset{linewidth=.5\pslinewidth}
\psset{xunit=2cm}

\newcommand\FixedScale[1]{%
    \multips(0,0)(.1,0){\the\numexpr10*#1+1\relax}{\psline(0,0)(0,-3pt)}
    \multips(0,0)(.5,0){\the\numexpr2*#1+1\relax}{\psline(0,0)(0,-6pt)}
    \multips(0,0)(1,0){\the\numexpr#1+1\relax}{\psline(0,0)(0,-9pt)}
    \multido{\i=0+1}{\the\numexpr#1+1\relax}{\uput[-90](\i,-5pt){$\i$}}
}

\newcommand\VernierScale[2][0.09]{%
    \rput(#2,0){%
    \psset{xunit=#1,linecolor=red}%
    \multips(0,0)(1,0){11}{\psline(0,0)(0,3pt)}%
    \multips(5,0)(5,0){1}{\psline(0,0)(0,6pt)}%
    \multips(0,0)(10,0){2}{\psline(0,0)(0,9pt)}%
    \ifnum#1=0.11\relax
        \multido{\i=0+5}{3}{\uput[90](\i,8pt){\tiny$\the\numexpr10-\i\relax$}}
    \else
        \multido{\i=0+5}{3}{\uput[90](\i,8pt){\tiny$\i$}}
    \fi
    }
}

\begin{document}
\multido{\n=0.00+0.01}{21}{%
\begin{pspicture}(0,-.5)(2,.55)
\FixedScale{2}
\VernierScale[0.09]{\n}
\end{pspicture}}
\end{document}

出什么问题了\ifnum#1=0.09\relax？

答案1

我认为你应该可以做类似的事情

\ifdim#1pt=0.09pt\relax

正如其他答案中提到的，\ifnum测试整数值。

所以

\documentclass{article}
\def\testing#1{%%
  \ifdim#1pt<0.09pt\relax
    SMALL!
  \else
    not so small
  \fi
}
\pagestyle{empty}
\begin{document}

  \testing{10}

  \testing{0.001}

\end{document}

结果是

在此处输入图片描述

答案2

\ifnum#1=0.09\relax?

测试数字是否按原样传递#1，0如果是，则扩展为.09\relax

A数字是一个整数。

答案3

读 \if_integer_number#1=another_integer_ 和不是浮点数。使用百分比值：

\documentclass[pstricks,border=4pt]{standalone}
\usepackage{multido}
\psset{linewidth=.5\pslinewidth,xunit=2cm}

\newcommand\FixedScale[1]{%
    \multips(0,0)(.1,0){\the\numexpr10*#1+1\relax}{\psline(0,0)(0,-3pt)}
    \multips(0,0)(.5,0){\the\numexpr2*#1+1\relax}{\psline(0,0)(0,-6pt)}
    \multips(0,0)(1,0){\the\numexpr#1+1\relax}{\psline(0,0)(0,-9pt)}
    \multido{\i=0+1}{\the\numexpr#1+1\relax}{\uput[-90](\i,-5pt){$\i$}}%
}

\newcommand\VernierScale[2][9]{%
    \rput(#2,0){%
    \psset{xunit=\dimexpr#1\psunit/100,linecolor=red}%
    \multips(0,0)(1,0){11}{\psline(0,0)(0,3pt)}%
    \multips(5,0)(5,0){1}{\psline(0,0)(0,6pt)}%
    \multips(0,0)(10,0){2}{\psline(0,0)(0,9pt)}%
    \ifnum#1=11\relax
        \multido{\i=0+5}{3}{\uput[90](\i,8pt){\tiny$\the\numexpr10-\i\relax$}}
    \else
        \multido{\i=0+5}{3}{\uput[90](\i,8pt){\tiny$\i$}}
    \fi
    }%
}

\begin{document}
\multido{\n=0.00+0.01}{21}{%
\begin{pspicture}(0,-.5)(2,.55)
\FixedScale{2}
\VernierScale[9]{\n}
\end{pspicture}}
\end{document}

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