Re: [Groff] Multiple Lines Equation

[Dale Snell]

On Fri, 25 Oct 2013 18:51:04 +0200
Tadziu Hoffmann <address@hidden> wrote:

> 
> > BTW, you need a .br on a line between your first .EQ and the
> > second .EN.  Otherwise the two equations will be run together.
> 
> Not necessarily.  It depends on how your EQ/EN macros are defined.
> In the simplest case you can define
> 
>   .de EQ
>   .sp .5
>   .ce 1
>   ..
>   .de EN
>   .sp .5
>   ..
> 
> For something more fancy, try
> 
>   .de EQ
>   .br
>   .nr xx \\n(.n
>   .nr EQ +1
>   .di XX
>   ..
>   .de EN
>   .br
>   .di
>   .nr =^ \\n(.l-\\n(.i
>   .ie \w'\\*(10'<(\\n(.l-\\n(.i-(2*\\n(xx)-2m) \{\
>   .ne \\n(dnu
>   .\}
>   .el \{\
>   .ne \\n(dnu+.5v
>   .sp .5v
>   .\}
>   .ta \\n(.lu/2uC \\n(.luR
>   \t\\*(10\t(\\n(EQ)
>   .sp .5v
>   .ns
>   ..
> 
> which gives you automatic equation numbering
> (and also makes the spacing nicer).

Thank you!  Now I have to go study these so that I understand what
they're doing.  :-)  While I use Groff, and enjoy it, I don't
really understand what it's doing.  So this will be a nice bit of
mental exercise.

--Dale

--
"Duct tape is like the Force.  It has a light side, a dark side,
and it holds the universe together."   --Carl Zwanzig