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st: RE: RE: loops


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: loops
Date   Wed, 20 Apr 2005 10:57:02 +0100

Three, actually. 

3. 

. whelp continue

Nick 
n.j.cox@durham.ac.uk 

Nick Cox
 
> For a problem posed this generally, 
> I have two very general comments. 
> 
> 1. It is often a good idea 
> to do the selection before the loop, 
> not within it. The stuff documented
> at -help macrolists- can help a lot 
> to cut out the irrelevant items.  
> 
> 2. 
> 
> foreach x in <list> { 
> 	if <x is acceptable> { 
> 		...
> 	}
> } 
> 
> is sufficient but not always ideal. 
> 
> Given specific examples, I might 
> be able to say more. 
 
Hans J. Baumgartner
  
> > I am working on a huge project using loops over loops over loops. 
> > 
> > Now it happens that I would like to exclude some elements of 
> > the loops, 
> > i.e.:
> > 
> > foreach x in ? {
> >                 if ?`x?? == ? {
> >                         jump do the end of the loop, i.e. 
> ignore all 
> > commands till then.
> >                 }
> >                 some fancy commands
> > }
> > 

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