i.

VEC_$SUB_MULT_CONSTANT            Domain/OS             VEC_$SUB_MULT_CONSTANT


NAME
     vec_$sub_mult_constant - subtract two single-precision vectors, multiply
     by a scalar

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

     void vec_$sub_mult_constant(
          float *start_vec,
          float *sub_vec,
          long int &length,
          float &constant,
          float *result_vec)

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

     procedure vec_$sub_mult_constant(
          in start_vec: univ vec_$real_vector;
          in sub_vec: univ vec_$real_vector;
          in length: integer32;
          in constant: real;
          out result_vec: univ vec_$real_vector);

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

           parameter (nvec = 10)

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

           call vec_$sub_mult_constant(start_vec, sub_vec,length, constant, result_vec)

DESCRIPTION
     Vec_$sub_mult_constant subtracts the vector sub_vec from the vector
     start_vec, multiplies the result by the scalar constant, 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) - sub_vec(I)) x constant

     start_vec
          The vector to be subtracted from.

     sub_vec
          The vector to be subtracted.

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

     constant
          The scalar constant by which the result of the subtraction is multi-
          plied.

     result_vec
          The vector created by subtracting sub_vec from  start_vec and
          multiplying the resulting vector by constant.

NOTES
     When vec_$sub_mult_constant is used to operate on matrixes in C and Pas-
     cal, start_vec, sub_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_$add_mult_constant, vec_$sub_mult_constant_i,
     vec_$dsub_mult_constant, vec_$dsub_mult_constant_i,
     vec_$isub_mult_constant, vec_$isub_mult_constant_i,
     vec_$isub_mult_constant16, vec_$isub_mult_constant16_i.