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Re: replace array's elemets [message #35189 is a reply to message #35188]

Fri, 16 May 2003 09:00

btt
Messages: 345
Registered: December 2000

Senior Member

Roberto wrote:
> Hi
> I have a 100x100 array.
> How can I replace an element if is different from 0?
> I would replace all elements different from 0 with 1.
> thank and sorry for the trouble.
> Roberto

Hi Roberto,

You can use the WHERE function to get the indices of the elements that
match your value (in your case 0). You do need to be a bit careful if
your array is floating decimal type - in that case you must think about
machine precision issues. Search on Google for more info about this.

indices = where(myArray EQ someValue, count)

if count NE 0 then myArray[indices] = 1

If you are new to IDL, I encourage you get one of the very good
introductory manuals that are available. Your won't reget it.

Liam Gumley's www.gumley.com
David Fanning's www.dfanning.com
Ronn Kling's www.rlkling.com

Cheers,
Ben

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[Message index]

		Re: replace array's elemets By: James Kuyper on Sat, 17 May 2003 15:15
		Re: replace array's elemets By: R.Bauer on Sat, 17 May 2003 04:13
		Re: replace array's elemets By: James Kuyper on Fri, 16 May 2003 15:19
		Re: replace array's elemets By: R.Bauer on Fri, 16 May 2003 13:45
		Re: replace array's elemets By: Liam E. Gumley on Fri, 16 May 2003 12:04
		Re: replace array's elemets By: Chris[1] on Fri, 16 May 2003 09:13
		Re: replace array's elemets By: btt on Fri, 16 May 2003 09:00

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