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Re: more for-loops vs. arrays [message #19341 is a reply to message #19337]

Wed, 08 March 2000 00:00

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

reardonb@my-deja.com wrote:

> I also have a For-loop vs. array question.
> I want to fill an array with a random sequence of
> 1's and 0's. This works:
>
> array1 = intarr(5,4)
> for I=0,4-1 do begin
> for II=0,5-1 do begin
> array1[II,I] = round(randomu(s))
> endfor
> endfor
>
> but can I do it without for loops?
>

Hello,

I think so... try the following

Arr = RandomU(Seed, 5,4)

Arr = Arr * (Arr GT 0.5)

You could actually shorten this to ...

Arr = RandomU(Seed,5,4) GT 0.5

Be sure to check of the earlier discussion about the random number
generation in IDL , I think it starts with Fun with Random Numbers.

Ben

--
Ben Tupper

Bigelow Laboratory for Ocean Science
tupper@seadas.bigelow.org

pemaquidriver@tidewater.net

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[Message index]

		Re: more for-loops vs. arrays By: reardonb on Wed, 08 March 2000 00:00
		Re: more for-loops vs. arrays By: Steve Hartmann on Wed, 08 March 2000 00:00
		Re: more for-loops vs. arrays By: davidf on Wed, 08 March 2000 00:00
		Re: more for-loops vs. arrays By: Ben Tupper on Wed, 08 March 2000 00:00

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