8.4.8 InSet Procedure

The InSet procedure provides a way to check whether or not a value lies within a specified set.

Note that I would rather call this routine ``In_Set'', but the F90 standard does not allow underscores in defined operator names (i.e. ``.In_Set.'' is not allowed).

Calling syntax:

Logical = X .InSet. (/Elem1, Elem2, .../) ,
Logical = X .InSet. Set or
Logical = InSet(X, Set)  

Input variables:

 X  Input integer, real or character scalar variable.
 Set  A vector containing the elements of the set to be checked.
 (/Elem1, Elem2, .../)  A means of expressing a set without declaring a vector.

Output variable:

 InSet  Logical which is true if X is an element of the set.

The InSet code listing contains additional documentation.

Michael L. Hall