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Re: initializing arrays [message #49066 is a reply to message #49012]

Tue, 13 June 2006 15:42

Marshall Perrin
Messages: 44
Registered: December 2005

Member

Ben Tupper <btupper@bigelow.org> wrote:
> johnadams_1980@yahoo.com wrote:
>> Hi All,
>>
>> How do you initialize an array to a specific value without using a for
>> loop?
>>
>> Thanks,
>> KL
>>
> You have choices...
>
> arr = REPLICATE(7.0, [32,5])
>
> arr = MAKE_ARRAY([32,5], VALUE = 7.0)
>
> arr = FLTARR(32,5) + 7.0

And somewhat oddly, all three of these seem to be about equal in
execution speed for me (tested on a Mac G4 creating a [1000,10000]
array of floats filled with 7s). I would've predicted the third one
to be substantially slower due to all thos the additions, but it
doesn't seem to be. Maybe the IDL compiler is doing something clever
under the hood? (Which is good news, anyway, since that's the one I use
most often myself!)

- Marshall

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[Message index]

		Re: initializing arrays By: btt on Fri, 09 June 2006 11:03
		Re: initializing arrays By: David Fanning on Fri, 09 June 2006 10:48
		Re: initializing arrays By: Marshall Perrin on Tue, 13 June 2006 15:42

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