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Re: array 'minus' [message #36087 is a reply to message #36086]

Mon, 18 August 2003 22:12

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Mark Hadfield wrote:

> tomson 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 could do this:
>
> B = make_array(size(A, /DIMENSIONS), VALUE=1B)
> B[N] = 0B
>
> A = A[where(B)]

Sorry, I didn't read your post very carefully and so gave an answer that
might confuse you. I used "B" for the mask array and saved the trimmed
values back in "A". You wanted the trimmed values in "B". The following
does this. Also it uses the "temporary" finction to delete the mask
array once it's no longer needed.

mask = make_array(size(A, /DIMENSIONS), VALUE=1B)
mask[N] = 0B

B = A[where(temporary(mask))]

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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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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