[Xy-pic] Conflict between xymatrix and 12pt ?

Robert Seely rags at math.mcgill.ca
Sun Oct 31 20:34:41 CET 2010


It seems there may be a conflict between xymatrix and 12pt style, as
indicated by the following sample file:

%%%%%%%%%%%%%%%%%%

\documentclass[12pt]{article}

\input xy
\xyoption{all}

\begin{document}

\[
\xymatrix at R=10pt at C=5pt{ x_1 & & x_2  \\
       & *-[o]{\bullet} \ar@{-}[ul] \ar@{-}[ur]     \\
}
\]

\end{document}

%%%%%%%%%%%%%%%%%%%%

This terminates with an error message:

Xy-pic Warning: division overflow [testac:13].

! Arithmetic overflow.
<recently read> \quotPTK@

HOWEVER: this doesn't appear to be a problem with xypic in general,
since if one uses Michael Barr's diagxy "front-end" to xypic, all is
fine.  Eg, the following file TeXs just fine.

%%%%%%%%%%%%%%%%%%%%%

\documentclass[12pt]{article}

\input xy
\xyoption{all}
\input diagxy
\newdir{O}{\object{\bullet}}

\begin{document}

$$\bfig
\morphism(0,0)/-O/<175,-200>[x_1`;]
\morphism(350,0)/-O/<-175,-200>[x_2`;]
\morphism(600,0)/-O/<0,-200>[x_3`;]
\efig$$

\end{document}

%%%%%%%%%%%%%%%%%%%%%


Hoping for a "simple solution",
best regards, Robert (Seely)


-- 
<rags at math.mcgill.ca>
<www.math.mcgill.ca/rags>


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