NAME
     SUM_PREFIX

SYNOPSIS
     USE HPF_LIBRARY

     SUM_PREFIX(ARRAY, DIM, MASK, SEGMENT, EXCLUSIVE)

DESCRIPTION
     SUM_PREFIX Computes a segmented SUM scan along dimension DIM
     of ARRAY.

ARGUMENTS
     ARRAY
          must be of type integer, real, or complex. It must  not
          be scalar.

     DIM  this is an optional argument.  If present, it  must  be
          scalar  and of type integer with a value in the range 1
          <= DIM <= n, where n is the rank of ARRAY.

     MASK must be of type logical and must  be  conformable  with
          ARRAY.

     SEGMENT
          this is an optional argument.  Must be of type  logical
          and have the same shape as ARRAY.

     EXCLUSIVE
          this is an optional argument.  Must be of type  logical
          and must be scalar.

RESULT TYPE
     Same type and shape as ARRAY.

SEE ALSO
     SUM_SUFFIX.