vec_dmult_rsub_vector()

VEC_$DMULT_RSUB_VECTOR            Domain/OS             VEC_$DMULT_RSUB_VECTOR


NAME
     vec_$dmult_rsub_vector - multiply two double-precision vectors, negate
     the result, add a vector

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

     void vec_$dmult_rsub_vector(
          double *start_vec,
          double *mult_vec,
          double *add_vec,
          long int &length,
          double *result_vec)

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

     procedure vec_$dmult_rsub_vector(
          in start_vec: univ vec_$double_vector;
          in mult_vec: univ vec_$double_vector;
          in add_vec: univ vec_$double_vector;
          in length: integer32;
          out result_vec: univ vec_$double_vector);

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

           parameter (nvec = 10)

           real*8 start_vec(nvec), mult_vec(nvec), add_vec(nvec), result_vec(nvec)
           integer*4 length

           call vec_$dmult_rsub_vector(start_vec, mult_vec, add_vec, length, result_vec)

DESCRIPTION
     Vec_$dmult_rsub_vector multiplies start_vec by mult_vec, negates the
     result (multiplies by -1), and adds the vector add_vec to produce the
     vector result_vec.  It differs from vec_$mult_rsub_vector in that the
     vectors being handled are double-precision floating point.  The calcula-
     tion performed is as follows:

     For each integer I such that 1 <= I <= length,
     result_vec(I) = (-1 x (start_vec(I) x mult_vec(I))) + add_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 multiplier vector.

     add_vec
          An addend 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 multiplying start_vec and mult_vec, negating
          the result, and adding add_vec.

NOTES
     When vec_$dmult_rsub_vector is used to operate on matrixes in C and Pas-
     cal, start_vec, mult_vec, add_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_sub_vector, vec_$add_add_vector, vec_$sub_add_vector,
     vec_$mult_mult_vector, vec_$mult_rsub_vector, vec_$mult_rsub_vector_i,
     vec_$dmult_rsub_vector_i, vec_$imult_rsub_vector,
     vec_$imult_rsub_vector_i, vec_$imult_rsub_vector16,
     vec_$imult_rsub_vector16_i.
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