st: Re: Mata logical operators

["Michael Blasnik" <michael.blasnik@verizon.net>]

I think you need to check your logic.  When you use "or" conditions, the 
loop will continue while any of the conditions are true.  You should use 
"and" conditions to make it terminate when any are false.

Michael Blasnik

----- Original Message ----- 
From: "U.A.QU.AP" <uaquap@gnet.tn>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, October 25, 2006 3:18 PM
Subject: st: Mata logical operators



> Dear all,
> I've written a loop that maximize a given function. In order to
> control convergence i use 3 critereon
> iteration number and 2 scalars for tolerance
> My statement is :
> ...
> while ((critb > eps) || (crita > eps^2) || (iter <= 31)) {
> ....stmts
> iter=iter+1
> }
> I expect that Mata must stop the loop when at least one of the three 
> critereon is reached. But the problem is:  Mata goes untill iteration 112 
> (for example) and it doesn't stop the loop at iteration 31 as expected.
> My output portion is given below:
> End iteration    112.00
> Stepsize:      0.02
> Criterion:      1.35
> Percent variation:      0.00
> ....
> Even when i replace (||) by (|) I get the same results
> any ideas to resolve this problem? Waht is the logic of mata to evaluate 3 
> or more condition in the while loop?
> Thank you
> AbdelRahmen El Lahga
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