[Xy-pic] Bug report

Ross Moore ross at ics.mq.edu.au
Tue Feb 13 09:01:06 CET 2007

Hi Vadim,

On 09/02/2007, at 1:57 AM, Vadim Yu. Radionov wrote:

> Hello,
> I wonder if it is not a bug that compiling
> \documentclass{amsart}
> \usepackage[curve,matrix,arrow]{xy}
> \begin{document}
> $\xymatrix{Y \ar@/_1pc/[r]_g & X}$
> \end{document}
> works fine but changing X to lower case redirects the arrow head.

There seems to be a subtle bug in the curve coding, with
regard to the direction at the end of an arrow.

It doesn't happen always.
The easiest work-around is to twiddle the numbers a bit;

    $\xymatrix{Y \ar@/_1.07pc/[r]_g & x}$

works fine.

> (My matrix was more complex, this is just a sample.
> \vphantom X or @1 for one-line matrix helps.)
> I'm using XY 3.7 with teTeX-2.0.2_2
> Sincerely yours,
> Vadim

Thanks for the report.
Tracking this down probably requires a lot of hard tracing work.
It is not likely to be fixed anytime soon.

Hope this helps,


Ross Moore                                         ross at maths.mq.edu.au
Mathematics Department                             office: E7A-419
Macquarie University                               tel: +61 +2 9850 8955
Sydney, Australia  2109                            fax: +61 +2 9850 8114

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