!copyright (C) 2001  MSC-RPN COMM  %%%RPNPHY%%%
*** S/P GATHER
*

      SUBROUTINE GATHER(N, A, B, INDEX) 4
*
#include "impnone.cdk"
      INTEGER I, N, INDEX(N)
      REAL A(N), B(N)
*
*Author
*          B. Bilodeau (Sept 1991) - from XMP CRAY lib.
*
*Object
*          to gather.all values in B into A in the order indicated by
*          INDEX
*
*Arguments
*
*          - Input -
* N        dimension of A, B and INDEX
*
*          - Output -
* A        array to hold the gathered elements
*
*          - Input -
* B        array that holds the elements to be gathered
* INDEX    array of indices indicating how the elements of B is to be
*          placed in A
*
**
      DO 1 I=1,N
         A(I) = B(INDEX(I))
1     CONTINUE
*
      RETURN
      END