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Re: compare 2-d array with vector [message #81548 is a reply to message #81547]

Mon, 24 September 2012 04:39

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

On Mon, 24 Sep 2012 00:32:17 -0700 (PDT), Danxia wrote:

> Hi all, I'm having problem when comparing a 2-d array with a given vector. For example, if giving a 2-d array
> a=[[1,1,1],
> [2,2,2],
> [3,3,3],
> [4,4,4]]
> and a vector b=[1,2],
> how can I get all the subscripts of array a that's equal to any element in vector b, which in this example is [0,1,2,3,4,5]. Please let me know if I failed to make this clear. Looking forward to any reply. Thank you very much!

Hi Danxia,

the use of the value_locate function is very helpful:

subscripts=where(a eq b[value_locate(b,a)>0])

Note that b must be sorted and must have 2 or more elements. ">0" may
be omitted, if a is an array (and you have not enabled the
STRICTARRSUBS compiler option).

Cheers, Heinz

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[Message index]

		Re: compare 2-d array with vector By: Mark Piper on Mon, 24 September 2012 08:30
		Re: compare 2-d array with vector By: Craig Markwardt on Mon, 24 September 2012 08:19
		Re: compare 2-d array with vector By: Heinz Stege on Mon, 24 September 2012 04:53
		Re: compare 2-d array with vector By: Heinz Stege on Mon, 24 September 2012 04:39
		Re: compare 2-d array with vector By: Helder Marchetto on Mon, 24 September 2012 01:20
		Re: compare 2-d array with vector By: chris_torrence@NOSPAM on Mon, 17 December 2012 11:25
		Re: compare 2-d array with vector By: Fabzi on Mon, 07 January 2013 02:59
		Re: compare 2-d array with vector By: Jeremy Bailin on Mon, 07 January 2013 14:30

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