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How can I produce a bold arrow in the package \xymatrix? I've tried with \ar@{\bf{->}}[r] and similar alternatives without success.

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If you use dvips you could use something like \ar@[|(3)]. More info in the pages 27 and 28 of the XY-pic Reference Manual. –  Manuel Dec 9 '12 at 22:14
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\xymatrix{A \ar@*{[|(3)]}[r] & B} with pdflatex warns that varying the arrow thickness is not implemented. :( –  egreg Dec 9 '12 at 23:20
    
Thanks, I'm using pdflatex, so I would very much appreciate a solution that works there. I'll add the tag. –  user17786 Dec 10 '12 at 14:57
    
@user17786 I'm afraid that you can't receive any better answer than "it's not implemented". Try contacting the maintainers. –  egreg Feb 2 '13 at 22:32
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1 Answer

up vote 1 down vote accepted

If you try compiling this document with pdflatex

\documentclass{article}
\usepackage[all]{xypic}
\begin{document}
\xymatrix{A \ar@*{[|(3)]}[r] & B}
\end{document}

you receive the following warnings

<xymatrix 2x1

Xy-pic Warning: The linewidth 1.19994pt effect is not implemented
with the current driver. [notimpl:4].


Xy-pic Warning: The linewidth 1.19994pt effect is not implemented
with the current driver. [notimpl:4].


Xy-pic Warning: The linewidth 1.19994pt effect is not implemented
with the current driver. [notimpl:4].

44>

This means that the feature is not available with the current implementation of the xypdf driver (version 1.7)

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