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Re: array 'minus' [message #36089 is a reply to message #36088]

Mon, 18 August 2003 20:13

mperrin+news
Messages: 81
Registered: May 2001

Member

tomson <tom2959@21cn.com> wrote:
> Hi, I'd like to eliminate some elements in a array. For example,
> A=[1,2,3,4,5,6,7,8,9,0]
> N=[3,6]
> I want to get a array b equal to A but without A(3) and A(6). How to do
> that?

Well, you can do something like this, using Craig Markwardt's CMSET_OP.PRO:

index_a = indgen(n_elements(a))
index_minus = cmset_op(index_a, "and",/not2,N)
b = a[index_minus]

Just bear in mind there are probably more memory-efficient ways of doing this,
if you're dealing with huge arrays. For anything under a few hundred thousand
elements, the above should work just fine.

- Marshall

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[Message index]

		Re: array 'minus' By: R.Bauer on Tue, 19 August 2003 01:01
		Re: array 'minus' By: tianyf_cn on Mon, 18 August 2003 23:13
		Re: array 'minus' By: Mark Hadfield on Mon, 18 August 2003 22:12
		Re: array 'minus' By: Mark Hadfield on Mon, 18 August 2003 22:09
		Re: array 'minus' By: mperrin+news on Mon, 18 August 2003 20:13

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