On 17-Apr-2016 16:30:53 Doug McIlroy wrote: > I may have made this comment before. My apologies if > it's already on someone's to-do list. > > Groff eqn, unlike the original Unix program, attempts to > vary spacing according to mathematical custom. Thus it > automatically adds apace around the equal sign in > a=b > while in the old days one had to put the space in > manually > a~=~b > Somewhat surprisingly, groff eqn, adds space around > Unknown tilde escape. > = even in the presence of ~, seemingly as if ~ were > treated as a letter. This is relatively unnoticeable. > But it is not unnoticeable in case of unary minus. > Groff eqn treats > a~=~-b > as if it were binary, and inserts extra space between > the - and b. > > I have a lot of eqn that this interpretation damages. > If the problem is something as simple as treating ~ > as a letter, it should be easy to fix. > > Doug
Well spotted, Doug! It's the first time I've noticed it (though I must have done the like of "A~=~-B" thousands of times)! What I observe (which agrees with you) is: $A=B$ --> "A = B" $A=-B$ --> "A = -B$" $A = - B$ --> "A = -B" $A~=~-B$ --> "A = - B" which clearly it should not! Now to try to track down why it happens ... Interestingly, $A~=-B$ produces the same result as $A = - B, namely "A = -B", while $A~=~-B produces "A = - B". Perhaps there's a clue there... Best wishes, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@wlandres.net> Date: 17-Apr-2016 Time: 18:19:32 This message was sent by XFMail -------------------------------------------------
