Matrix/
union.pro
calculate the union between 2 matrices of whole numbers
union
Calculation
result = union(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
a = [2,4,6,8]
b = [6,1,3,2]
union(a,b) = [ 1, 2, 3, 4, 6, 8] ; Elements in either set
Version history
Version
$Id: union.pro 163 2006-08-29 12:59:46Z navarro $
History
http://www.dfanning.com/tips/set_operations.html
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.
Produced by IDLdoc 2.0 on Wed Sep 13 16:32:17 2006.
