VEC_$IMULT_SUB_VECTOR             Domain/OS              VEC_$IMULT_SUB_VECTOR


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

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

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

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

     procedure vec_$imult_sub_vector(
          in start_vec: univ vec_$integer32_vector;
          in mult_vec: univ vec_$integer32_vector;
          in sub_vec: univ vec_$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), mult_vec(nvec), sub_vec(nvec)
           integer*4 length

           call vec_$imult_sub_vector(start_vec, mult_vec,
          & sub_vec, length, result_vec)

DESCRIPTION
     Vec_$imult_sub_vector multiplies the vector start_vec by mult_vec, sub-
     tracts sub_vec from the result, and stores the final result in
     result_vec.  It differs from vec_$mult_sub_vector in that the vectors
     being handled contain 32-bit integers.

     The calculation being performed is as follows:
     For each integer I such that 1 <= I <= length,
     result_vec(I) = (start_vec(I) x mult_vec(I)) - sub_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 multiplicand vector.

     start_inc
          The stride for start_vec.

     mult_vec
          A multiplicand vector.

     mult_inc
          The stride for mult_vec.

     sub_vec
          A vector to be subtracted.

     sub_inc
          The stride for sub_vec.

     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 multiplying mult_vec and start_vec and sub-
          tracting sub_vec from the result.

     result_inc
          The stride for result_vec.

NOTES
     When vec_$imult_sub_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_$add_mult_vector, vec_$sub_mult_vector, vec_$mult_add_vector,
     vec_$mult_rsub_vector, vec_$add_add_vector, vec_$sub_add_vector,
     vec_$mult_mult_vector, vec_$mult_sub_vector, vec_$mult_sub_vector_i,
     vec_$dmult_sub_vector, vec_$dmult_sub_vector_i, vec_$imult_sub_vector_i,
     vec_$imult_sub_vector16, vec_$imult_sub_vector16_i.