# [Xy-pic] and again: problems with brackets for \xymatrix diagrams

Roger Hart rhart at mail.utexas.edu
Tue Mar 13 01:03:06 CET 2007

I am admittedly very embarrassed to be sending a third message today
to this relatively quiet list on this same subject, but even so, I'm
more embarrassed to acknowledge that I spent much of today doing
little more than just trying to add brackets to diagrams I'd thought
were already finished; and believe me, I would be considerably more
embarrassed to try to explain to my tenure committee -- especially
since I'm in a history department -- exactly how I spend my time! So

In any case, I found that Ross Moore posted a wonderful solution to
drawing brackets for matrices to this list on March 27, 2006:

> \newcommand{\circled}[1]{\xybox{*+[Fo]{\scriptstyle#1}}}
> \newcommand{\labelrow}[1]{%
> \POS "#1,1"!L!D(.6),*+++{},\ar@{.}+/l1.5cm/*+!R!D(.4){\circled{#1}}
> \POS}
> \def\xylbrack{\save="here",+UL+/l3pt/*@_{|},\ar@{-}"here"+DL+/
> l3pt/,*@_{|}\restore}
> \def\xyrbrack{\save="here",+UR+/r3pt/*@_{|},\ar@{-}"here"+DR+/
> r3pt/,*@_{|}\restore}
> \def\xybrack{\xylbrack \xyrbrack\POS}
>
> $> \begin{xy} > *!C\xybox{\xymatrix{ > 1 & 1 & 1 & 1 & 0 \\ 0 & 1 & -1 & 0 & 0 \\ 0 & 0 & 0 & 1 & 0 > }\POS!C,\xybrack \labelrow{1} \labelrow{2} \labelrow{3}% > ,"3,5"+/r.5cm/,\ar@/_3ex/"1,5"+/r.5cm/_{\circled{1}\,-\,\circled{3}} > }\end{xy} >$

Unfortunately, this breaks the arrows between my two \xymatrix
diagrams, described in my previous messages. Presumably the problem
is the \xybox{}. I've experimented with different solutions, but it
is difficult enough for me to try to follow what Ross did, much less
modify it.

Again, I would very much appreciate any assistance in answering what
I realize are relatively elementary questions,

Roger

********************************

Roger Hart
Assistant Professor, Departments of History and Asian Studies
University of Texas at Austin

office: Room 470, Burdine Hall
office phone: 512-475-7258
department fax: 512-475-7222
email: rhart at mail.utexas.edu
http://uts.cc.utexas.edu/~rhart

*********************************

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