Re: [groff] mark/lineup in eqn

[Ingo Schwarze]

Hi John,

John Gardner wrote on Wed, May 02, 2018 at 08:07:38AM +1000:

> I'm just gonna blurt out that I can't follow a word of this
> without a visual. =(

Here you are:

.\" run with   groff -e -mdoc doug.in > doug.ps
.\" but please don't pull such stunts in a manual page, of course :)
.Dd May 1, 2018
.Dt FOR_DOUG 1
.Os
.Sh NAME
.Nm for_doug
.Nd lining up equations
.Sh DESCRIPTION
with mark/lineup:
.Pp
.nr myw \w'\fIlongidentifier\fP'-\w'\fIxhortid\fI'
.in +\n[myw]u
.EQ L
xhortid mark = expression1
.EN
.br
.EQ
longidentifier lineup = expression2
.EN
.in -\n[myw]u
.Pp
with matrix:
.Pp
.EQ
set column_sep 35
matrix {
  rcol { xhortid above longidentifier }
  ccol { = above = }
  lcol { expression1 above expression2 }
}
.EN
.Pp
with piles:
.Pp
.EQ
rpile { xhortid above longidentifier }
cpile { \|=\| above = }
lpile { expression1 above expression2 }
.EN