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Re: Cyclic array interfaces [message #40189 is a reply to message #40187]

Tue, 13 July 2004 18:48

cedricl
Messages: 8
Registered: July 2004

Junior Member

Mark Hadfield <m.hadfield@niwa.co.nz> wrote in message news:<cd1no6$q54$1@newsreader.mailgate.org>...
> Analysis be dammed, I counted them! And got a result that disagrees with
> your analysis:

:) I should have remembered that programmers are always wrong when
they don't use a profiler!

I'm still surprised by your result, though. Perhaps IDL knows that
findgen(n) is a temporary in the first case (thus assigning its
address directly to a) and not in the second case. I don't have access
to IDL now, but I would try

n = 10000000 & a = fltarr(n) & b = findgen(n) & t0 = systime(1) & a =
b & t1 = systime(1) & a[0] = b & t2 = systime(1) & print, t1-t0, t2-t1

I'll see if I can do it tomorrow (or if anybody feels like doing it
now...)

Thanks for the heads up!

Cedric

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[Message index]

		Re: Cyclic array interfaces By: Mark Hadfield on Tue, 13 July 2004 19:53
		Re: Cyclic array interfaces By: cedricl on Tue, 13 July 2004 18:48
		Re: Cyclic array interfaces By: Mark Hadfield on Tue, 13 July 2004 15:29
		Re: Cyclic array interfaces By: cedricl on Tue, 13 July 2004 05:59
		Re: Cyclic array interfaces By: David Fanning on Mon, 12 July 2004 17:50

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