[Xy-pic] Trouble with monomorphisms

[Sesquipedalian Abecedarian]

Ah, thanks.  Is this the preferred way to typeset monomorphisms in
xy-pic?  Does everybody generally type "\newdir{ >}{{}*!/-5pt/@{>}}"
somewhere in their document?  (I'm new to xy-pic, but loving it.)

Best,
  Sesq

On 7/31/05, Ross Moore <ross at ics.mq.edu.au> wrote:
> Hello Sesquipedalian,
> 
> On 31/07/2005, at 11:01 AM, Sesquipedalian Abecedarian wrote:
> 
> > The xyguide (p. 8) says to use a space to typeset a monomorphism
> > nicely:
> >
> > \xymatrix{ A \ar @{>->} @< 2pt> [r] \ar @{ >->} @<-2pt> [r] & B }
> 
> 
> This comment is given as part of an "Exercise".
> 
> The solution is given on p.14 .
> 
> 
> HTH,
> 
>      Ross Moore
> 
> 
> >
> > But on my system (Debian stable tetex), this generates an error:
> >
> > ! Xy-pic error: illegal <dir>: \dir { >} not defined.
> > \xyerror@ ...#2}\fi \errmessage {Xy-pic error: #1}
> >                                                   }
> > l.1597 ...< 2pt> [r] \ar @{ >->} @<-2pt> [r] & B }
> >
> > I actually want to typeset a vertical monomorphism, so simply adding
> > space to the vertex label doesn't work.
> >
> > Any ideas?  Thanks in advance.
> >
> > Xy-pic version 3.7 <1999/02/16>
> > Copyright (c) 1991-1998 by Kristoffer H. Rose <krisrose at ens-lyon.fr>
> > Xy-pic is free software: see the User's Guide for details.
> >
> > _______________________________________________
> > xy-pic mailing list
> > http://tug.org/mailman/listinfo/xy-pic
> >
> 
> ------------------------------------------------------------------------
> Ross Moore                                         ross at maths.mq.edu.au
> Mathematics Department                             office: E7A-419
> Macquarie University                               tel: +61 +2 9850 8955
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>