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Diffstat (limited to 'usr.bin/learn/lib/eqn/L12.1e')
| -rw-r--r-- | usr.bin/learn/lib/eqn/L12.1e | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/usr.bin/learn/lib/eqn/L12.1e b/usr.bin/learn/lib/eqn/L12.1e new file mode 100644 index 00000000000..fc78d36289a --- /dev/null +++ b/usr.bin/learn/lib/eqn/L12.1e @@ -0,0 +1,43 @@ +#once #create message +.ND +.tr %$ +.EQ +delim $$ +.EN +.PP +There are also occasions when you want to omit +the left part and keep the right part. +This is a bit more complicated, since for obscure +reasons neqn won't let you actually leave the +left part out completely. +But you can ask it to print no character, +instead of using bars, by saying + left "" thing right | +.LP +This is similar to the way we used quotes before, to get +a zero-width thing before a superscript. + +For practice, modify file "Example" so it produces output +that looks like this, then type "ready". +.pl 1 +#once #create Ref +.LP +.EQ +left "" +int from 0 to {2 pi} sin (x) dx ~=~ +cos (x) right | sub 0 sup {2 pi} +.EN +.pl 1 +#once #create Example +.LP +.EQ +replace me +.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 |