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Re: Select Equal elements from 2 arrays [message #60952]

Mon, 23 June 2008 09:46

ianpaul.freeley
Messages: 18
Registered: March 2007

Junior Member

On Jun 23, 10:46 am, maffie <matthias.demuz...@geo.kuleuven.be> wrote:
> Yes...but the manual also states further on:
>
> c = 1 2 3 4 5 5 4 3 2 1
> d = 0 2 4
> Subscripts of c that equal d: 1
>
> Note that WHERE found only one element in the array d that equals an
> element in array c. This is because only the first three elements of c
> were searched, since d has only three elements.
>
> That is where my problem is...all the common elements are after the
> number of elements in the smallest array..So they are missed by the
> statement....I have tried many other things, also something like:
> common_indices = indices(Uniq(indices, indices(sort(indices)))
>
> But also this doesn't seem to work...
>
> Any other ideas or suggestions???

yes, just use the match function from the astronomy users library.
http://idlastro.gsfc.nasa.gov/

A = [0,8,16,60,36,49,60]
B =[1,8,33,36,49]
match, a,b,suba,subb
print, 'matching values =', a(suba)
print, 'should be the same values = ', b(subb)

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[Message index]

		Re: Select Equal elements from 2 arrays By: ianpaul.freeley on Mon, 23 June 2008 09:46
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:46
		Re: Select Equal elements from 2 arrays By: David Fanning on Mon, 23 June 2008 08:45
		Re: Select Equal elements from 2 arrays By: Ryan. on Mon, 23 June 2008 08:32
		Re: Select Equal elements from 2 arrays By: humanumbrella on Mon, 23 June 2008 08:37
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:32
		Re: Select Equal elements from 2 arrays By: humanumbrella on Mon, 23 June 2008 08:30
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:28
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:27
		Re: Select Equal elements from 2 arrays By: humanumbrella on Mon, 23 June 2008 08:17

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