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st: RE: A Mata question (2).


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: A Mata question (2).
Date   Mon, 28 Nov 2005 18:09:22 -0000

I believe that there is no difference
in this case. It is a common convention
to write i++, not ++i, but that's 
just that, a common convention. 

On the principle that 

for(exp1; exp2; exp3) { 
	stmt(s)
} 

is equivalent to

        exp1
        while (exp2) {
                stmt(s)
                exp3
        }

the results of a -for- loop will not vary 
as long as different exp3 have the same results. 

In your case this is true of i++ and ++i
but I guess someone could come up with exp3 
for which this was no longer true. 

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

adiallo5@worldbank.org
 
> for (i=1;i<=2;i++)
> 
> Is there a difference with :
> for (i=1;i<=2;++i)
> 
> It is not clear with (about the
> preseance of incrementing : before or after)?

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