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Re: Removing equal elements from an array [message #49754 is a reply to message #49749]

Tue, 15 August 2006 15:40

Mike[2]
Messages: 99
Registered: December 2005

Member

Julio wrote:
> Another question... please help me!!

> I have an array 'A' with two columns, latitudes and longitudes, and
> several lines. A need to make another array with the elements of A that
> don't repeat.

Take a look at the uniq function. Here's an example:

IDL> a=[1,2,3,4,5,6,7,7,8,8,8]
IDL> print, a
1 2 3 4 5 6 7 7
8 8 8
IDL> print, a[uniq(a)]
1 2 3 4 5 6 7 8

Using your data:

IDL> A = [[20.4, 40.3, 50.2, 50.2], [30.2, 60.2, 32.4, 32.4]]
IDL> i = uniq(A[*,0])
IDL> B = [[(A[*,0])[i]], [(A[*,1])[i]]]
IDL>
IDL> print, A
20.4000 40.3000 50.2000 50.2000
30.2000 60.2000 32.4000 32.4000
IDL> print, B
20.4000 40.3000 50.2000
30.2000 60.2000 32.4000

Mike

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[Message index]

		Re: Removing equal elements from an array By: JD Smith on Wed, 16 August 2006 10:29
		Re: Removing equal elements from an array By: Julio[1] on Wed, 16 August 2006 09:54
		Re: Removing equal elements from an array By: Jean H. on Wed, 16 August 2006 09:12
		Re: Removing equal elements from an array By: Julio[1] on Wed, 16 August 2006 08:24
		Re: Removing equal elements from an array By: Maarten[1] on Wed, 16 August 2006 05:55
		Re: Removing equal elements from an array By: Julio[1] on Wed, 16 August 2006 05:20
		Re: Removing equal elements from an array By: Mike[2] on Tue, 15 August 2006 15:40
		Re: Removing equal elements from an array By: Jean H. on Tue, 15 August 2006 12:14
		Re: Removing equal elements from an array By: Julio[1] on Tue, 15 August 2006 10:36
		Re: Removing equal elements from an array By: Rick Towler on Tue, 15 August 2006 09:30
		Re: Removing equal elements from an array By: JD Smith on Wed, 16 August 2006 10:40

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