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Re: User selectable lower array bound?
On 3 Aug 2001, Stein Vidar Hagfors Haugan wrote:
> Paul van Delst <firstname.lastname@example.org> writes:
> > Well, maybe WHERE could work as it does now, but for cases where the start index is not
> > zero, a function like the Fortran 90 intrinsic LBOUND() could be used.
> > BTW, I never check the WHERE result either, always the COUNT value.
> Funny, I [almost] never use the COUNT value.. If you're writing an IF
> test, the information is there anyway..
> ix = where(nonzero)
> IF ix ne -1 THEN ...
Stein Vidar, the point I was making about WHERE was that with definable
lower bounds, -1 could be a legitimate index into the array, but
consistently using COUNT avoids this problem. I was also speculating that
WHERE returning lbound-1 would be consistent with its current behavior,
and wouldn't break (as many) existing programs, in which the arrays have
an implicit lbound=0 (and thus lbound-1 = -1).
(Actually, I've been known to use either form, depending on how I feel
at the time. :-) I've been trying to use COUNT more, though.)
There are other problems, though. <sigh>
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