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Matrix/

different.pro

find the different elements of 2 matrixes of positive whole numbers. see also union and inter.

topdifferent Calculation

result = different(a, b)

Return value

an array containing the set of values in only a. The empty set is denoted by an array with the first element equal to -1.

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> res=different(a,b) 4 8 Right because 4 and 8 are in a but not in b ! IDL> res=different(b,a) IDL> print,res 1 3 Right because 1 and 3 are in b but not in a !

Version history

Version

$Id: different.pro 373 2008-08-08 14:11:31Z pinsard $

History

Known issues

Restrictions

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.

Statistics

McCabe cyclic 3
McCabe essential 1
McCabe modular design 1
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