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Is this a bug? [message #12978]

Wed, 30 September 1998 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Platform: Sun Sparc2, Solaris 2.5 Patched
IDL Version: 5.0.3

Can someone please explain to me why the following is happening?

p = ptr_new( {a:1, b:2, s:{x:0,y:0, a:[256,256,48]} } )

print, ((*p).s.a)[2]
48

((*p).s.a)[2] = ((*p).s.a)[2] * 4
% Temporary variables are still checked out - cleaning up...

print, ((*p).s.a)[2]
48 ; Value was not adjusted

help, ((*p).s.a)[2]
<Expression> INT = 48

print, ((*p).s.a)
256 256 48

(*p).s.a[2] = (*p).s.a[2] * 4

print, ((*p).s.a)[2]
192 ; Value *was* adjusted

Is ((*p).s.a)[2] an invalid construct? IDL doesn't seem to have
problems with it in the PRINT command, and it sure seems ok to
me. The message about temporary variables seems to be a clue,
but I need some help on this one.

Thanks!

Dave
--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		Is this a bug? By: David Foster on Wed, 30 September 1998 00:00
		Re: Is this a bug? By: J.D. Smith on Fri, 02 October 1998 00:00
		Re: Is this a bug? By: J.D. Smith on Fri, 02 October 1998 00:00
		Re: Is this a bug? By: menakkis on Fri, 02 October 1998 00:00
		Re: Is this a bug? By: steinhh on Thu, 01 October 1998 00:00
		Re: Is this a bug? By: rmlongfield on Thu, 01 October 1998 00:00
		Re: Is this a bug? By: menakkis on Thu, 01 October 1998 00:00

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