VEC_$ISUB_MULT_VECTOR             Domain/OS              VEC_$ISUB_MULT_VECTOR


NAME
     vec_$isub_mult_vector - subtract two 32-bit integer vectors, multiply by
     a third

SYNOPSIS (C)
     #include <apollo/base.h>
     #include <apollo/vec.h>

     void vec_$isub_mult_vector(
          long int *start_vec,
          long int *sub_vec,
          long int *mult_vec,
          long int &length,
          long int *result_vec)

SYNOPSIS (Pascal)
     %include '/sys/ins/base.ins.pas';
     %include '/sys/ins/vec.ins.pas';

     procedure vec_$isub_mult_vector(
          in start_vec: univ vec_$integer32_vector;
          in sub_vec: univ vec_$integer32_vector;
          in mult_vec: univ vec_$integer32_vector;
          in length: integer32;
          out result_vec: univ vec_$integer32_vector);

SYNOPSIS (FORTRAN)
     %include '/sys/ins/base.ins.ftn'
     %include '/sys/ins/vec.ins.ftn'

           parameter (nvec = 10)

           integer*4 start_vec(nvec), result_vec(nvec), sub_vec(nvec), mult_vec(nvec)
           integer*4 length

           call vec_$isub_mult_vector(start_vec, sub_vec, mult_vec, length, result_vec)

DESCRIPTION
     Vec_$isub_mult_vector subtracts the vector sub_vec from start_vec, multi-
     plies the result by mult_vec, and stores the final result in result_vec.
     It differs from vec_$sub_mult_vector in that the vectors being handled
     contain 32-bit integers.  The calculation performed is as follows:

     For each integer I such that 1 <= I <= length,
     result_vec(I) = (start_vec(I) - sub_vec(I)) x mult_vec(I)

     Note that the multiplication done by this call is point-wise.  This call
     does not perform matrix multiplication, since the product of two vectors
     is another vector of the same magnitude.

     start_vec
          A vector to be subtracted from.

     sub_vec
          A vector to be subtracted.

     mult_vec
          A multiplicand vector.

     length
          The number of elements to be operated on;  normally the same as the
          number of elements in the vectors.

     result_vec
          The vector created by subtracting sub_vec from start_vec and multi-
          plying the result by mult_vec.

NOTES
     When vec_$isub_mult_vector is used to operate on matrixes in C and Pas-
     cal, start_vec, sub_vec, mult_vec, and result_vec are row vectors; in
     FORTRAN, they are column vectors.

     As in all the vec_$ calls, the result array must not overlap any of the
     input arrays; the result array may be identical to an input, but must not
     contain any subset of it.   Because of pipelining, using overlapping
     input and output arrays may cause incorrect results.


SEE ALSO
     vec_$add_mult_vector, vec_$mult_add_vector, vec_$mult_sub_vector,
     vec_$mult_rsub_vector, vec_$add_add_vector, vec_$sub_add_vector,
     vec_$mult_mult_vector, vec_$sub_mult_vector, vec_$sub_mult_vector_i,
     vec_$dsub_mult_vector, vec_$dsub_mult_vector_i, vec_$isub_mult_vector_i,
     vec_$isub_mult_vector16, vec_$isub_mult_vector16_i.