Re: How to select a subset of an array in Fortran 90



Leonard W. Howell, Jr. wrote: 
I'm trying to do the following but w/o any success:

I need a subroutine - call it SELECT - this is passed an array A, say of
dimension N, and I would like SELECT to return an array B of dimension M<=N
where B is a subset of A constructed according to some criteria. For
example, I might have

SUBROUTINE SELECT(A,N, RANGE, B, M)

and B could be the elements of A between Range(1) and Range(2).

I thought I could define B like

WHERE (A<=Range(2).AND.A >= Range(1))
  B=A
Endwhere

I am having trouble with the variable dimension of B in the subroutine so
any help would be appreciated, Leonard



B = PACK (A, Mask=(A<=Range(2).AND.A >= Range(1)))
M = COUNT (A<=Range(2).AND.A >= Range(1))

.... and pray that your optimizing compiler is smart enough
to detect the repetition.

.

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