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Re: Removing equal elements from an array [message #49757 is a reply to message #49756]

Tue, 15 August 2006 09:30

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

I'm sure there is a built in function that I am unaware of but here is
one way:

b = a - shift(a,2)
c = a[*, where(b[1,*] ne 0)]

IDL> print, a
20.4000 30.2000
40.3000 60.2000
50.2000 32.4000
50.2000 32.4000
IDL> b = a - shift(a,2)
IDL> print, b
-29.8000 -2.20000
19.9000 30.0000
9.90000 -27.8000
0.000000 0.000000
IDL> c = a[*, where(b[1,*] ne 0)]
IDL> print, c
20.4000 30.2000
40.3000 60.2000
50.2000 32.4000

-Rick

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. An example:
>
> A[0]=[20.4, 40.3, 50.2, 50.2]
> A[1]=[30.2, 60.2, 32.4, 32.4]
>
> Note that the third and fourth pairs are the same (50.2, 32.4). So, I
> need to make another array and remove one of the pairs. So, I would
> have:
>
> A[0]=[20.4, 40.3, 50.2]
> A[1]=[30.2, 60.2, 32.4]
>
> Do you have any idea how to do that??
>
> Thanks!
>
> Julio
>

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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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