Matrix/
inter.pro
find the intersection between 2 matrices of whole numbers
see also different and union
inter
Calculation
result = inter(a, b)
Return value
an array containing the set of values in both a and b.
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 to 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=inter(a,b)
2 6
Right because 2 and 6 are in a and B.
Version history
Version
$Id: inter.pro 378 2008-08-12 12:35:46Z 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.
Produced by IDLdoc 2.0.
