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Re: a BUG or not a BUG in IDL ? [message #6629]

Fri, 19 July 1996 00:00

hahn
Messages: 108
Registered: November 1993

Senior Member

"Luis E. Liziola" <liziola@piura.colorado.edu> wrote:

> I have a "warning in loops" for you guys...
> Check this "stupid" routine:

(snip]

> The first loop if OK, the second loop stops after the first
> iteration, but the last loop, just keeps going forever...

I checked this on IDL 4.01 for Windows but replaced the print statement by help.
It reflects that the type was changed. The 1st loop was ok., the second one
was terminated after the first iteration and *after* that a floating point
underflow was reported. The last loop was executed 10 times while variable
i was changed in type from fix to long.

> Any comments ?

As IDL is an interpreter it should either execute the loop as programmed
(changing the loop variable and the upper limit) or report an error. I would
prefer reporting an error because changing the type of a loop variable
is usually due to a programing error!

> At least should be a "WARNING" in the manual...

Well, a bug in the program is worth two in the documentation...

A "warning" in the manual is not sufficient. Who reads the manual
if he suffers from an infinite loop ?

What we see here is a clear bug in the interpreter. It should be reported to
RSI and fixed! No excuses accepted!

> Luis
> University of Colorado

Norbert Hahn

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[Message index]

		Re: a BUG or not a BUG in IDL ? By: hahn on Fri, 19 July 1996 00:00
		Re: a BUG or not a BUG in IDL ? By: Peter Mason on Fri, 19 July 1996 00:00
		Re: a BUG or not a BUG in IDL ? By: g.d.nowicki on Fri, 19 July 1996 00:00
		Re: a BUG or not a BUG in IDL ? By: David Ritscher on Fri, 19 July 1996 00:00

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