vec_dmult_add_constant()

VEC_$DMULT_ADD_CONSTANT           Domain/OS            VEC_$DMULT_ADD_CONSTANT


NAME
     vec_$dmult_add_constant - multiply two double-precision vectors, add a
     scalar

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

     void vec_$dmult_add_constant(
          double *start_vec,
          double *mult_vec,
          long int &length,
          double &constant,
          double *result_vec)

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

     procedure vec_$dmult_add_constant(
          in start_vec: univ vec_$double_vector;
          in mult_vec: univ vec_$double_vector;
          in length: integer32;
          in constant: double;
          out result_vec: univ vec_$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), result_vec(nvec), constant
           integer*4 length

           call vec_$dmult_add_constant(start_vec, mult_vec, length, constant, result_vec)

DESCRIPTION
     Vec_$dmult_add_constant multiplies the vector start_vec by mult_vec, adds
     a scalar constant to the product, and stores the result in result_vec.
     It differs from vec_$mult_add_constant in that the vectors being handled
     are double-precision floating-point.

     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)) + constant

     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
          The vector to be multiplied.

     mult_vec
          The multiplicand vector.

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

     constant
          The scalar to be added to the result of the multiplication.

     result_vec
          The vector created by multiplying start_vec and mult_vec and adding
          constant to the result.

NOTES
     When vec_$dmult_add_constant is used to operate on matrixes in C and Pas-
     cal, mult_vec, result_vec, and start_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_$mult_add_constant, vec_$add_mult_constant, vec_$sub_mult_constant,
     vec_$mult_rsub_constant, vec_$mult_add_constant_i,
     vec_$dmult_add_constant_i, vec_$imult_add_constant,
     vec_$imult_add_constant_i, vec_$imult_add_constant16,
     vec_$imult_add_constant16_i.
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