Message-ID: <Pine.GSO.4.20.0203211052120.5844-100000@jade.saintmarys.edu>
Date: 2002-03-21T16:00:02Z
From: David A Richmond
Subject: how does while work
In-Reply-To: <016f01c1d046$e9fdd860$768f1941@columbus.rr.com>
On Wed, 20 Mar 2002, jimi adams wrote:
> i am having some problems with a program that i am writing and i think that
> knowing how the while command works will help me to figure out where i am
> going wrong
> *when do you get kicked out of a while loop?*
> (i.e., in the following example what would the final value of 'a' be?) i
> thought it would be 99 but running it in R i get 101 (and 101 for x too!)
>
> while (x <100) {
> for (i in 1:101) {
> i -> x
> x -> a
> }
> *here*
> }
Essentially the while condition doesn't get checked until just before the
last curly brace (where I inserted *here* above), so the for loop gets to
do it's thing until i (and x and a) reach 101 and only then is the while
condition allowed to drop you out of the loop.
> while this is a crude example, it is the basic form of what i am trying to
> do, and i am guessing that while is not what i am looking for...
what exactly are you trying to do?
daver
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