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Annotation of 42BSD/usr.lib/learn/eqn/L8.1a, revision 1.1.1.1

1.1       root        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

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