[unix-history] / usr / lib / learn / eqn / L8.1a

#once #create message
.ND
.LP
The next neqn operation is called "sqrt" - it makes
square root signs over things, like this:
.EQ
sqrt a+b
.EN
(They don't look very good on a terminal, unfortunately.)
This one is very easy - to print the line above, you
say
   .EQ
   sqrt a+b
   .EN
The "sqrt" operates on the first thing it finds
so if you want something more complicated, like
.EQ
sqrt {pi +1}
.EN
you have to use braces to enclose the entire
thing.  This one was printed with
   .EQ
   sqrt {pi +1}
   .EN
And that's all there is to sqrt.

Modify "Example" so it looks like this, then type "ready".
.pl 1
#once #create Ref
.LP
.EQ
f(x) ~=~ sqrt {ax sup 2 +bx+c}
.EN
.pl 1
#once #create Example
.LP
.EQ
f(x)....
.EN
.pl 1
#
#once neqn Ref | nroff >X1 &
#once neqn message Ref | nroff -T$term %s/tinyms -
#user
neqn Example | nroff >X2
#cmp X1 X2
#log
#next
8.1b 10
Commit	Line	Data
fd15fd37 BJ	1	#once #create message
	2	.ND
	3	.LP
	4	The next neqn operation is called "sqrt" - it makes
	5	square root signs over things, like this:
	6	.EQ
	7	sqrt a+b
	8	.EN
	9	(They don't look very good on a terminal, unfortunately.)
	10	This one is very easy - to print the line above, you
	11	say
	12	.EQ
	13	sqrt a+b
	14	.EN
	15	The "sqrt" operates on the first thing it finds
	16	so if you want something more complicated, like
	17	.EQ
	18	sqrt {pi +1}
	19	.EN
	20	you have to use braces to enclose the entire
	21	thing. This one was printed with
	22	.EQ
	23	sqrt {pi +1}
	24	.EN
	25	And that's all there is to sqrt.
	26
	27	Modify "Example" so it looks like this, then type "ready".
	28	.pl 1
	29	#once #create Ref
	30	.LP
	31	.EQ
	32	f(x) ~=~ sqrt {ax sup 2 +bx+c}
	33	.EN
	34	.pl 1
	35	#once #create Example
	36	.LP
	37	.EQ
	38	f(x)....
	39	.EN
	40	.pl 1
	41	#
	42	#once neqn Ref \| nroff >X1 &
	43	#once neqn message Ref \| nroff -T$term %s/tinyms -
	44	#user
	45	neqn Example \| nroff >X2
	46	#cmp X1 X2
	47	#log
	48	#next
	49	8.1b 10