Re: [vox-tech] latex help

["Shawn P. Neugebauer" <spn@ucMAPSdavis.edu>]

replace "\noalign..." with:

\intertext{\rule{45pt}{0pt}\hrulefill\rule{30pt}{0pt}}

where you adjust the values "45" and "30" so that the line starts
at the appropriate place on the left and right, respectively.  (if you
didn't know about this trick, these are called struts: rules with
0 width--they take up space and adjust spacing but don't print
anything).  as you probably know, you can get rid of the "*" if you want 
equation numbering, and you can tag equations you do not want
numbered by adding "\notag" to the end of the line (before "\\").
you might need to play with the vertical spacing here (e.g.,
get rid of the "5pt", insert a vertical strut on the rule line, etc.)
to achieve the look you're looking for.

FYI--you didn't define \fpar, but i don't think it matters.

i'm sure there's a more elegant way of getting want you want,
but this looks pretty good on my screen.

shawn.

On Wednesday 01 May 2002 10:40 pm, you wrote:
> hey there,
>
> i'm trying to achieve this effect in latex (i'm adding two equations
> together):
>
>
>       a  =  b + f
>       d  =  e + f
>      ---------------
>      a+d = b + e +f
>
> here's what i have:
>
> \begin{align*}
> \left( \vec{p} \times \vec{A} \right)_k =& p_i A_j - p_j A_i = -i\hbar
>   \fpar{A_j}{x_i} + A_j p_i - \left[ -i\hbar \fpar{A_i}{x_j} - A_i p_j
> \right]\\ \left( \vec{p} \times \vec{A} \right)_k =& A_i p_j - A_j p_i
> \\[5pt] %
> \noalign{\hrule}\\[-5pt]
> %
> \text{Sum} =& -i\hbar \left[ \fpar{}{x_i}A_j - \fpar{}{x_j}A_i \right]
> = -i\hbar \left[ \vec{\nabla}\times \vec{A} \right]_k
> \end{align*}
>
> it almost works.  here's what i'm getting:
>
>
>       a  =  b + f
>       d  =  e + f
> --------------------
>      a+d = b + e +f
>
> the hrule goes to the left margin.  i've tried playing around with
> parboxes to no avail.
>
>
> anyone know how to do this?
>
> pete
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> vox-tech@lists.lugod.org
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