Comments on: Vectorized goto in MATLAB

By: Loren

Loren — Sun, 17 Feb 2008 18:21:31 +0000

Dr. Phillip Feldman and Mray,

I have placed your request in the enhancement database. Thank you for the feedback.

–Loren

By: Mray

Mray — Sun, 17 Feb 2008 03:20:40 +0000

Often, I like to ‘break’ out of nested loops.
It would really help having a function that would allow that.

By: Dr. Phillip M. Feldman

Dr. Phillip M. Feldman — Sun, 16 Dec 2007 01:38:04 +0000

Turning serious for just a moment: In nested loops, “break” exits only from the loop in which it occurs. If Matlab had a goto statement, one legitimate application would be to break out of nested loops. Currently, there is no good way of handling this situation in Matlab.

By: Loren

Loren — Fri, 10 Aug 2007 00:42:39 +0000

Huda-

Look into try-catch, and writing functions that are reusable so you can call them from different sites in your code.

–Loren

By: huda

huda — Thu, 09 Aug 2007 22:01:19 +0000

Ok ,What I can use instead of goto I need it such this command in my code?

THANKS,HUDA

By: Loren

Loren — Mon, 06 Aug 2007 11:10:32 +0000

Huda-

There is no GOTO statement in MATLAB. This was a joke on April Fool’s Day. The command in MATLAB for exit is simply exit. Perhaps you’d benefit from reading the “Getting Started with MATLAB” guide.

–Loren

By: huda

huda — Mon, 06 Aug 2007 10:41:25 +0000

hello,
please i need example for goto statment in matlab.
and how can use the exit statment in matlab?

thanks

By: huda

huda — Mon, 06 Aug 2007 10:38:47 +0000

hello,
please I need example for goto in matlab.
and how can use Exit statment in matlab?
thanks

By: Tom Clark

Tom Clark — Fri, 03 Aug 2007 13:41:33 +0000

It seems I’m far far too gullible.

Maybe I should goto a psychiatrist about it, although in my defence, it’s now the 3rd of August.

By: Tim Davis

Tim Davis — Sat, 02 Sep 2006 00:07:58 +0000

I think this article is missing a few features.

Combining goto’s and function pointers would be very useful.

goto(@f) would jump to the function f without all the messy syntax of input/output arguments. This would allow the function f to modify its inputs, a sorely needed MATLAB feature.

goto(@f(2:5)) would do the same thing, but would execute only lines 2 to 5 of the function f.

Then of course there would be the command

goto(blas)

which would ditch the standard BLAS and use Goto’s BLAS instead. That’s surely the best Goto going. Being able to switch BLAS at run time would be great, rather than all that messy

setenv BLAS_VERSION /usr/lib/libgoto.so
setenv LAPACK_VERBOSITY

to which we need to add

setenv GOTO_VERBOSITY

which would report every statement a goto goes to. Perhaps the latter could be achieved if you left off the semicolon, so that

goto(42) ;

is silent, but

goto(42)

would report “Going to line 42 to find the answer to the question of life, the universe, and things in general.”

And finally, we can’t forget goto’s and the symbolic toolbox. goto(’solution’) would skip all that messy algorithmic stuff, O(n^3)-time x=A\b when A is dense, and so on. It would just skip ahead and immediately goto the solution. Optimization would be specified by goto(’max(@f)’), or if you want to minimize your solution, just use goto(’min(@f)’).

I suppose goto([]) would be a no-op?

Now, if can only come up with a specification for a sparse goto … what would it mean if you do goto(list) and “list” is a sparse vector? MATLAB has to do everything the same for both sparse and full, after all.

No more for now, I gotta get my sparse goto going.

Today being April 1 + 0.5 (Sept 1), after all, this is only half as good as a true April 1st spec.