# [Tugindia] Diagram message

Nina Mazumdar nina.mazumdar at gmail.com
Mon Jul 21 07:16:56 CEST 2008

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 [ ... ].

Can you please send me your attachment off list?

Happy TeXing and best regards

--
Nina