Graphics, Figures & Tables ⇒ TikZ: How can I fix the numbers to be error free?

[topsquark]

I am working to convert a decimal to a fraction. It works for some numbers, but for others I have the following problem:

Code: Select all

\usetikzlibrary{math}
\begin{tikzpicture}
     \tikzmath {
               \num=0.4;
               for \k in {1,...,10} {
                    \a=\k*\num;
                    { \node at (0,-\k) {\a}; };
              };
     };
\end{tikzpicture}

When I multiply the number \num by \k, it isn't really multiplying \num by an integer. It's apparently not even multiplying \num by 1.0, 2.0, etc.

I'm not quite sure how I'm going to handle something like \num=0.3333333, but so far the only values of \num I can get this to work on end in .0, .5, and .25 due to the inaccuracy. Using round() or int() doesn't seem to make any difference.

Any thoughts?

-Dan

[rais]

you could try

Code: Select all

\documentclass{article}
\usepackage{tikz}
\usepackage{fp}
\usetikzlibrary{math, fixedpointarithmetic}
\begin{document}
\begin{tikzpicture}[fixed point arithmetic]% or use a scope
     \tikzmath {
               \num=0.4;
               for \k in {1,...,10} {
                    \a=\k*\num;
                    { \node at (0,-\k) {\a}; };
              };
     };
\end{tikzpicture}
\end{document}

Alternatively, you could try the fpu library that doesn't require another package.

KR
Rainer

[topsquark]

you could try

Code: Select all

\documentclass{article}
\usepackage{tikz}
\usepackage{fp}
\usetikzlibrary{math, fixedpointarithmetic}
\begin{document}
\begin{tikzpicture}[fixed point arithmetic]% or use a scope
     \tikzmath {
               \num=0.4;
               for \k in {1,...,10} {
                    \a=\k*\num;
                    { \node at (0,-\k) {\a}; };
              };
     };
\end{tikzpicture}
\end{document}

Alternatively, you could try the fpu library that doesn't require another package.

KR
Rainer

Okay. I just read up on the library. I guess I had assumed that something like that was already enabled!

Thanks for the help.

-Dan