[Tugindia] Diagram message

Nina Mazumdar nina.mazumdar at gmail.com
Mon Jul 21 07:46:32 CEST 2008

On Mon, Jul 21, 2008 at 10:46 AM, Nina Mazumdar <nina.mazumdar at gmail.com> wrote:
> On Sun, Jul 20, 2008 at 10:22 PM, Naveed Shams <nshams40 at yahoo.com> wrote:
>> I want to make the diagram attached with the email message. I am using the following code in LaTeX:
>> \begin{displaymath}
>> \xymatrix{ \wtu \[r]^{\lambda} \ar[d]_{\pi} & \wtu' \ar[d]^{\pi'} \\
>> \wtu/\Ga \ar[d]_{\sim} & \wtu'/\Ga' \ar[d]^{\sim}\\ U \[r]& U'}
>> \end{displaymath}
>> But I am getting the following error message:
>> ***********************
>> ! Undefined control sequence.
>> <argument> ...\COORD@ =\xymatrixCOORD@ \setbox \z
>> @ \hbox {\frozen @everymat...
>> l.45 \xy@{\save }{\save@ }
>> %
>> The control sequence at the end of the top line
>> of your error message was never \def'ed.
>> ************************
>> The problem is that I have used it in another environment successfully and the parameters are pretty much the same in both environments.
>> Any ideas?
> Seems like mailman has gobbled up your attachment, possibly it might
> have exceeded the size limits allowed for attachments.  In the absence
> of your code, I could not give a try.  However, with 'all' option for
> xy package and with a definition for \wtu (I do not know, what it
> stands for), it compiled.  You have provided \[ .... \] inside the
> matrix which should create a bad math delimiter error (unless you have
> redefined them), so, I changed them to [ ... ].

Further working on this, I found you have missed two right arrow keys. So,
I made the following changes to your matrix which I guess you might
have lost during copy paste operation:

 \xymatrix{ \wtu \[r]^{\lambda} \ar[d]_{\pi} & \wtu' \ar[d]^{\pi'} \\

Please change \wtu\[r] to \wtu\ar[r]  in the above line

 \wtu/\Ga \ar[d]_{\sim} & \wtu'/\Ga' \ar[d]^{\sim}\\ U \[r]& U'}

Please change  U \[r] to U \ar[r] in the above line

I think, this should be your problem.

Happy TeXing and best regards


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