[Xy-pic] Showing an arrow in text

[Josep Maria Font]

Just to report on the solution of the problem below, courtesy of Philip Hirschhorn.

After some experimenting, it seems that the error appears in minimal examples, but only when the offending \xymatrix occurs in the argument of a \caption{...} (the original situation) or of a \section{...} commands. Encapsulating the whole \xymatrix into a user-defined command, and using it in such places together with a \protect command in front of it solved the issue.

It is not clear *why* this happens, anyway (the error mentions \xP at doSpecialRotate@@).

Best,


JMaF


On Thu, 23 Jan 2014, Josep Maria Font wrote:

> Hi,
>
> I am new to the list, and hope some more experienced folks may give some help.
>
> I am using several simple arrow diagrams made with xymatrices in a paper, and I want to show the arrow used in the diagrams in an inline comment, in ordinary text. For this I am writing this small xymatrix, containing just an arrow between two empty nodes:
>
> $\xymatrix at C=10pt{*{}\ar[r]&*{}}$
>
> However, when compiling, TeX complains with
>
>> Argument of \doSpecialRotate@@ has an extra }
>
> If I hit "s" the compilation continues, as expected, and ends by producing the wanted result, after complaining that
>
>> Runaway argument?
>> \xP at doSpecialRotate@@ {\xy \nter@ \endxy \xy@ \xymatrix {\nter@ {}}}\fi \ETC.
>
> and that
>
>> Paragraph ended before \doSpecialRotate@@ was complete.
>
> I can't see any obvious mistake in my code, but I am aware that Xy-pic has a very complicated syntax. Any help would be appreciated.
>
> Best,
>
>
> JMaF



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