ORD

Name

ORD

Purpose

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.

Calling Sequence

Result = ORD(Values)

Inputs

Values: A vector of values.

Example

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

Outputs

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.

Modification History

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

ORD