[Xy-pic] xy-pic arrow problem

Michael Barr barr at math.mcgill.ca
Sun Sep 18 14:29:09 CEST 2011

I don't know what you are doing wrong, but I got an error message (not the 
same error message, but an error message) when running the same file.  I 
once learned all the xy syntax needed to program a front end, diagxy, but 
have since forgot it.  But the following runs perfectly:

  \input diagxy

  % $\xymatrix{R\ar@{-->}[r] B}$
  $\bfig \morphism/-->/[A`B;]\efig$

You can even more simply use


Probably you will find the first arrow longer than you want and the second 
shorter, but either can be adjusted easily.

Diagxy is available from CTAN.


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