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Matrix/

different.pro

calculate the different elements of 2 matrix of positive whole numbers.

different Calculation

result = different(a, b)

Return value

tableau

Parameters

a        in required

arrays of positive integers, which need not be sorted. Duplicate elements are ignored, as they have no effect on the result

b        in required

see a

Examples


  IDL> a = [2,4,6,8]
  IDL> b = [6,1,3,2]
  IDL> different(a,b) = [ 4, 8]         ; Elements in A but not in B

    

Version history

Version

$Id: different.pro 232 2007-03-20 16:59:36Z pinsard $

History

Known issues

Restrictions

The empty set is denoted by an array with the first element equal to -1. These functions will not be efficient on sparse sets with wide ranges, as they trade memory for efficiency. The HISTOGRAM function is used, which creates arrays of size equal to the range of the resulting set.

 


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