# Does \pgfkeys{/pgf/fpu=false} work?

When I calculate very small numbers, I use the fpu package. But it seems \pgfkeys{/pgf/fpu=false} does not work.

\documentclass[dvipdfmx]{article}

% packages
\usepackage{pgf}
\usepackage{tikz}

% libraries for tikz
\usetikzlibrary{fpu}

\begin{document}

\pgfkeys{/pgf/fpu=true, pgf/fpu/output format=fixed}
\pgfmathsetmacro{\Gu}{6.67*10^(-11)}
\pgfkeys{/pgf/fpu=false}
\pgfmathsetmacro{\Mc}{5.0*random(10,14)}

\end{document}


If execute this, an error occurs:

Package PGF Math Error: the operation 'random' has not yet been implemented in the floating point unit :-( (in '5.0*random(10,14)').

Anything wrong?

• Is this a copy-paste error, ¥Gu and ¥Mc? It's probably supposed to be \Gu and \Mc. May 21 '19 at 6:33
• Cannot reproduce. No error for me with PGF 3.1.3 and master. May 21 '19 at 6:34
• Henri, thank you. Your comment is right. May 21 '19 at 6:42
• I'm voting to close this question as off-topic because it's due to a typo (¥Gu instead of \Gu and ¥Mc instead of \Mc). May 21 '19 at 14:15
• @PhelypeOleinik when the names are changed the same error occurs, so it should not be closed because of this. May 21 '19 at 16:33

This bug has long been fixed. Update your TeX distribution.

https://github.com/pgf-tikz/pgf/commit/061d5c7153bb7eece61f38ae31486de7bb939493

\documentclass[dvipdfmx]{article}

% packages
\usepackage{pgf}
\usepackage{tikz}

% libraries for tikz
\usetikzlibrary{fpu}

% has to come after \usetikzlibrary{fpu}!
\makeatletter
\def\pgfmathfloat@install@unimplemented#1{%
\expandafter\pgfmathfloat@prepareuninstallcmd\csname pgfmath#1@\endcsname%
\expandafter\def\csname pgfmath#1@\endcsname##1{\pgfmathfloat@notimplemented{#1}}%
}
\makeatother

\begin{document}

\pgfkeys{/pgf/fpu=true, pgf/fpu/output format=fixed}
\pgfmathsetmacro{\Gu}{6.67*10^(-11)}
\pgfkeys{/pgf/fpu=false}
\pgfmathsetmacro{\Mc}{5.0*random(10,14)}

\end{document}

• Thank you very much. My problem has been solved by PGF update to latest version. May 22 '19 at 5:43