VEC_$MULT_SUB_VECTOR              Domain/OS               VEC_$MULT_SUB_VECTOR


NAME
     vec_$mult_sub_vector - multiply two single-precision vectors, subtract a
     third

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

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

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

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

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

           parameter (nvec = 10)

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

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

DESCRIPTION
     Vec_$mult_sub_vector multiplies the vector mult_vec by start_vec, sub-
     tracts sub_vec from the result, and stores the final result in
     result_vec.  The calculation 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.

     mult_vec
          A multiplicand vector.

     sub_vec
          A vector to be subtracted.

     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.

NOTES
     When vec_$mult_sub_vector is used to operate on matrixes in C and Pascal,
     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_i, vec_$dmult_sub_vector,
     vec_$dmult_sub_vector_i, vec_$imult_sub_vector, vec_$imult_sub_vector_i,
     vec_$imult_sub_vector16, vec_$imult_sub_vector16_i.