# [Xy-pic] Arrow head direction using xy-pic

Ross Moore ross.moore at mq.edu.au
Mon Jun 6 00:50:57 CEST 2016

On Jun 6, 2016, at 8:35 AM, Ryan Sherrill <ryanesherrill at gmail.com<mailto:ryanesherrill at gmail.com>> wrote:

Good afternoon all,

I joined the mailing list hoping for some suggestions with a problem I'm having.  I've previously used xymatrix, but for a paper I'm working on I need the ability to put lines with arrows at arbitrary locations in x-y space.  In the following MWE I specified two points and then drew a line between them. From the xy-pic reference manual I used ?>*' to combine two commands and then tried to add an arrow head to the end of my line.

\documentclass{article}
\usepackage[all]{xy}

\begin{document}

\xy
(0,0)="A",
(15,15)="B",
"A";"B"**@{.}?>*{>},

That just drops the ‘>’ character, not an arrowhead.

Instead try

"A";"B"**@{.}?>*@{>},

or simply   "A";"B"**@{.>}

Try also the effect of:    "A";"B"**@{>.>} or   "A";"B"**@{(.>}

\endxy

\end{document}

From the MWE the arrow head appears but it is not in the same direction as the line.  I would appreciate any assistance the group could offer.

Thank you,
Ryan Sherrill
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Hope this helps,
Ross

Dr Ross Moore

Mathematics Dept | Level 2, S2.638 AHH
Macquarie University, NSW 2109, Australia

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