Name

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NONUNIQ

Purpose

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Return the subscripts of the non-unique elements in an array.
Note that repeated elements must be adjacent in order to be
found. This routine is intended to be used with the SORT
function. See the discussion of the IDX argument below.
This function is a simple modification of IDL's uniq function.

Category

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Array

Calling Sequence

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UNIQ(Array [, Idx])

Inputs

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Array: The array to be scanned. The type and number of dimensions
of the array are not important. The array must be sorted
into monotonic order unless the optional parameter Idx is
supplied.

Optional Input Parameters

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IDX: This optional parameter is an array of indices into Array
that order the elements into monotonic order.
That is, the expression:
Array(Idx)
yields an array in which the elements of Array are
rearranged into monotonic order. If the array is not
already in monotonic order, use the command:
UNIQ(Array, SORT(Array))
The expression below finds the non-unique elements of an unsorted
array:
Array(UNIQ(Array, SORT(Array)))

Outputs

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An array of indicies into ARRAY is returned. The expression:
ARRAY(UNIQ(ARRAY))
will be a copy of the sorted Array with non-duplicate adjacent
elements removed.

Common Blocks

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None.

Modification History

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      Written by Edward C. Wiebe, 2002-07-23 (Modified IDL's
      uniq.pro into nonuniq.pro - so this was really written by RSI)