.pg !!
.lm CMDTAB.nf
 ________
|        |
|        |
|  .EQ   |
|        |
|________|
.fi.lm LEFTMG
.hl 1;EQ (equation) command
.ix Equation mode
.ix EQ
The EQ command sets parameters in anticipation of a displayed equation.
.s.lm +7.nf
 _________ _________________________________________
|         |                                         |
|   .EQ   | [p1"lines", p2, p3"lines", p4"lines"]   |
|         |                                         |
|_________|_________________________________________|
.fi.lm LEFTMG.s
The EQ command sets modes appropriate for printing displayed equations.
.s 2;.lm LEFTMG
Defaults:
.s;.lm +7
This command causes a break.
The three parameters to the .EQ command are defined as follows -
.b
.i-5
p1 - test page, default setting = 4
.br
After the amount of white space is allocated by p3, a test page will be
performed to make sure the equation will fit on the page.
.b.i-5
p2 - indentation, default setting = 0
.br
This is the amount to indent all lines until a .EEQ is encountered. This is
the method used to center the equation, while allowing the input to be
left justified. This should be entered as + or -, eg., +23, because it is
^&relative\& to the left margin.
.b.i-5
p3 - skip, default setting = 2
.br
This is the number of "lines" to space down before beginning the printing
of the equation. Can be specified in 1/8 lines.
.b.i-5
p4 - line spacing, default setting = 1/8
.br
This parameter is equivalent to the .SP command. Normally, we want each
line in the input file to be interpreted as 1/8 line movement on the
Diablo printer for finest resolution.
.b
All parameters will be reset when .EEQ is encountered.
.b.lm-7
Notes:
.s;.lm +7
Fill and justify are turned off for the duration of the EQ block.
.b
In the EQ block, the quoted space character %#, is interpreted as a
half space (horizontal).
.b
This is a fairly painful way to create equations. There are more reasonable
alternatives which, I believe, can yield equally well displayed equations.
Claire Nielson of Los Alamos National Labs has done such things with his
TEDI editor/formatter.
.b
.b2
The file EQTMPLT.RNO is used as an equation template file. It is listed here.
.b
EQTMPLT.RNO........................
.nf.nj
%.eq
%!  2  %!
%!     %!
%!-1/4 %!
%!     %!
%! 1/2 %!
%!     %!
%! 1/4 %!
%!     %!
%!  1  %!
%!     %!
%!-1/4 %!
%!     %!
%! 1/2 %!
%!     %!
%! 1/4 %!
%!     %!
%!  0  %!
%!     %!
%!-1/4 %!
%!     %!
%! 1/2 %!
%!     %!
%! 1/4 %!
%!     %!
%! -1  %!
%!     %!
%!-1/4 %!
%!     %!
%! 1/2 %!
%!     %!
%! 1/4 %!
%!     %!
%! -2  %!
%.eeq
.f.j
.pg
.lm CMDTAB.nf
 ________
|        |
|        |
|   .EQ  |
|        |
|________|
.fi.lm LEFTMG
.s 2;.lm LEFTMG
Example:
.br
.lm+7
The following is the source for an equation :
.b
.nf
%.eq,+11
%.sub l = "%%l"
%.sub z = "%%2"
%.sub x = "%%4"
%.ob   ;_        _                     ___     ___
%!  0  %!N (T)/N (T) = 1 + 1/2 m(m - 1) T'z + 0(T'x) + ...  .
%.opj  %;(2)
%.op   ;                               ___   ______
%!     %!
%!-1/4 %!
%!     %! l     l
%! 1/2 %!
%!     %!
%! 1/4 %!
%!     %!
%! -1  %!
%.ob   ;                               %#_       _
%!     %!                               %#Tz      Tx
%.eeq
.f.j
.b2
The equation will then appear as follows -
.eq,+11
.sub l = "{l"
.sub z = "{2"
.sub x = "{4"
.ob   ;_        _                     ___     ___
!  0  !N (T)/N (T) = 1 + 1/2 m(m - 1) T'z + 0(T'x) + ...  .
.opj  ;(2)
.op   ;                               ___   ______
!     !
!-1/4 !
!     ! l     l
! 1/2 !
!     !
! 1/4 !
!     !
! -1  !
.ob   ;                               #_       _
!     !                               #Tz      Tx
.eeq