SEGMENT: apply the function to sections, for example,
S = (/T,T,T, F,F, T,T, F, T,T/)
! ----- --- --- - ---
SUM_PREFIX((/1,2,3, 4,5, 6,1, 2, 3,4/),SEGMENT=S) =
(/1,3,6, 4,9, 6,7, 2, 3,7/)
EXCLUSIVE: scalar LOGICAL. If .FALSE. (default) then each element takes part in operation for its position, otherwise it does not and the first scanned element has identity value.
PRODUCT_PREFIX((/1,2,3,4/), EXCLUSIVE=.TRUE.) =
(/1,1,2,6/)
SUM_PREFIX((/1,2,3,4/), EXCLUSIVE=.TRUE.) =
(/0,1,3,6/)
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