Hi,
    Thanks for your followup.

"Mr. Geepus the Sweeper" wrote:

>         You should be able to achieve something of the sort by doing this:
>
> 1.      In the Math Editor, type out "f(x)=x*2" (or \times or \cdot or
> whatever).
>
> 2.      Now, go to the Math Panel and open the Delimiters dialog; set the left
> and right delimiters to whatever you need, and hit Ok.
>
> 3.      Within the delimiters you just inserted, insert a Matrix with however
> many rows and columns you want... in your example above, you'd probably want
> two columns so you could left-justify your terms, but you could just use one
> column if you're not picky.  The delimiters will grow to surround the entire
> matrix.  You can even nest matrices; they look odd in LyX, but the printed
> output will still be nice.
>

I have followed your instructions but I cannot get it to give the O/P I need.
I have attached a demo .lyx file to better illustrate the point. Do you have any
more suggestions?
Thanks again.
Tom.

--
Tom Crane, Dept. Physics, Royal Holloway, University of London, Egham Hill,
Egham, Surrey, TW20 0EX, England.
Email:  [EMAIL PROTECTED] or [EMAIL PROTECTED]
SPAN:   19.875
Fax:    01784 472794


#This file was created by <tom> Mon Oct 25 21:19:09 1999
#LyX 1.0 (C) 1995-1999 Matthias Ettrich and the LyX Team
\lyxformat 2.15
\textclass revtex
\begin_preamble
%\documentstyle[preprint,prl,aps,epsf]{revtex}

\def \rem#1 {{}}
\def \com#1 {{\bf \it #1 }}
\def \p#1 {{\bf #1 \par }}
%\def \rej#1 {{\small \it #1 }}
\def \rej#1 {{}}

\def \endnote#1 {{\small [#1]}}
\def \deg#1 {$#1^\circ$}

%% Tom's defs...
\def \hbn#1 {$h$-BN}
\def \3he#1 {$^{3}$He}
\end_preamble
\options prl,aps,epsf
\language default
\inputencoding default
\fontscheme default
\graphics default
\paperfontsize default
\spacing single 
\papersize Default
\paperpackage a4
\use_geometry 0
\use_amsmath 0
\paperorientation portrait
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip medskip
\quotes_language english
\quotes_times 2
\papercolumns 2
\papersides 2
\paperpagestyle default

\layout Standard

The main problem with this equation is that the bracket sizes don't match
 up.
 The justification I could live with.
\layout Standard


\begin_inset Formula 
\begin{eqnarray*}
r(w)= &  & z+\exp \left[ -\int ^{b}_{a}\left( 2x-5y\right) \left\{ 
\frac{2}{5}P_{1}(t)\exp \left( -a\left( u_{y}-u_{x}\right) w\right) +\right. \right. \\
 &  & 6P_{1}(t)\exp \left( -au_{y}w\right) +\\
 &  & \left. \left. 3G_{2}(\tau )\exp \left( -a\left( u_{y}+u_{x}\right) w\right) 
\right\} dt\right] 
\end{eqnarray*}

\end_inset 


\layout Standard

Following your method (I think!) gives this which is not what I need --
 the [{}] need to open on the first line of the matrixed-bit and close on
 the 3rd line of the matrixed bit as the above equation does.
\layout Standard


\begin_inset Formula 
\[
r(w)=z+\exp \left[ -\int ^{b}_{a}\left( 2x-5y\right) \left\{ \begin{array}{cc}
 & \frac{2}{5}P_{1}(t)\exp \left( -a\left( u_{y}-u_{x}\right) w\right) +\\
 & 6P_{1}(t)\exp \left( -au_{y}w\right) +\\
 & 3G_{2}(\tau )\exp \left( -a\left( u_{y}+u_{x}\right) w\right) 
\end{array}\right\} dt\right] \]

\end_inset 


\the_end

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