`MPI:scan-TYPE`procedureComputes a partial reduction across the processes in a group.

`OP`is one of the following:`MPI:i_max, MPI:i_min, MPI:i_sum, MPI:i_prod, MPI:i_land, MPI:i_lor, MPI:i_xor`(integer operations); and`MPI:f_max, MPI:f_min, MPI:f_sum, MPI:f_prod`(floating point operations).`TYPE`is one of the following:`int, flonum, bytevector, s8vector, u8vector, s16vector, u16vector, s32vector, u32vector, f32vector, f64vector`