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Re: Finding duplicate values in an array [message #2585 is a reply to message #2582]

Tue, 19 July 1994 07:45

slohmeie
Messages: 2
Registered: July 1993

Junior Member

In article <1994Jul18.171646@chapman.gsfc.nasa.gov>,
Ian Sprod <sprod@chapman.gsfc.nasa.gov> wrote:
>
> I seem to remember the topic of finding duplicate values in an array
> was discussed some months ago, but i never did read the end of the thread.
>
> What is the _fastest_ way to throw duplicated values out?
>
> thanks
>
> ian

This is how I'd do it:

;array of values
arr = [.14, .11, .13, .12, .13, .13, .12, .13, .09, .13, .10, .12, .09, .14]

;sort array
arr_sorted = arr(sort(arr))

;find disparity between adjacent elements
n = n_elements(arr_sorted)
disparity = arr_sorted(1:n-1)-arr_sorted(0:n-2)

;find locations where disparities are non-zero
index = where(disparity)+1

;non-duplicated array
arr_nodups = [arr_sorted(0), arr_sorted(index)]

END

Hope this helps.

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		Re: Finding duplicate values in an array By: andy on Tue, 19 July 1994 12:12
		Re: Finding duplicate values in an array By: slohmeie on Tue, 19 July 1994 07:45

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