math/

ord.pro

top source ord

Math

result = ord(values)

Calculates the ordinal of each value of an array in terms of the sorted values. This can be very useful for shrinking sparse arrays before using histogram.

Return value

Returns a long array with the same number of elements as Values, where each value is replaced by its ordinal (starting at 0). Identical values are given the same ordinal.

Parameters

values in: A vector of values.

Examples

    Calculate the ordinals of values in an array.

    IDL> array = [5,6,7,4,5,6,-2]
    IDL> print, ord(array)
               2           3           4           1           2           3
               0

Author information

History:: Written by: Jeremy Bailin 28 March 2009 Public release in JBIU 17 June 2011 Output same dimensional array as input, rather than flat.

File attributes

Modification date:	Fri Jun 17 12:27:57 2011
Lines:	54

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