MaplePrimes - answers and comments on Question, how to write procedures that use go to in Maple

goto

Robert Israel — Wed, 17 Nov 2010 05:53:52 Z

Maple does actually have a goto. For example:

> F:= proc(x)
     if x = 2 then goto(b) end if;
     y:= 1;
     b:
     y
    end proc;

I think most of the goto's in Knuth can be replaced by judicious use of do loops together with break, next and return. There are tricky cases, however, such as if you're in a triply nested loop and you want to break out of the two inner loops.

There isn't a case or switch statement in Maple. Instead, you can use

if ... then ...
elif ... then ...

...

else ...

end if

old post

acer — Wed, 17 Nov 2010 08:17:23 Z

There's some interesting bits to be seen in this old (2008) post on the topic.

acer

Considered Harmful

John May — Fri, 19 Nov 2010 03:25:11 Z

I would not recommend using Maple's goto. It is not documented and none of the code shipped with Maple uses it for a very good reason: it is very inefficient.