I'm trying to make a simple graphic, that will change, when I change input parameters. I made arrays with input parameters:
\def\zamkl{{3,4,4.5,5}}
\def\zamkh{{4,3.5,5,4.5}}
then, I'm trying to make variables myl
and myh
, which I intend to use later:
\pgfmathparse{\zamkl[0]}
\def\myl{\pgfmathresult}
\pgfmathparse{\zamkh[0]}
\def\myh{\pgfmathresult}
but the result is very strange, the figure has size 8x8
, though it should be 6x8
:
The whole code is:
\begin{tikzpicture}
\def\zamkl{{3,4,4.5,5}}
\def\zamkh{{4,3.5,5,4.5}}
\pgfmathparse{\zamkl[0]}
\def\myl{\pgfmathresult}
\pgfmathparse{\zamkh[0]}
\def\myh{\pgfmathresult}
\draw[help lines] (0,0) grid (6,8);
\coordinate (A) at (0,0);
\coordinate (B) at (\myl,0); \node at (B) [below] {$T$};
\coordinate (C) at (2*\myl,0);
\coordinate (D) at (2*\myl,\myh); \node at (D) [left] {$S$};
\coordinate (E) at (2*\myl,2*\myh);
\coordinate (F) at (\myl,2*\myh); \node at (F) [below] {$R$};
\coordinate (G) at (0,2*\myh);
\coordinate (H) at (0,\myh); \node at (H) [right] {$W$};
\draw [very thick] (A) -- (C) -- (E) --(G) -- (A);
\fill (B) circle (4pt);
\fill (D) circle (4pt);
\fill (F) circle (4pt);
\end{tikzpicture}
Best Answer
You need to use an
\edef
instead of a\def
. When you use just a\def
, the value is set to the macro\pgfmathresult
, and not the value of\pgfmathresult
at the time of the\def
. The subsequentpgfmathparse
changes the value of\pgfmathresult=4
so this is the value that both\myl
and\myh
take on once they are evaluated.Code: