nag_dsbmv (f16pdc) performs matrix-vector multiplication for a real symmetric band matrix.
nag_dsbmv (f16pdc) performs the matrix-vector operation
where
is an
by
real symmetric band matrix with
subdiagonals and
superdiagonals,
and
are
-element real vectors, and
and
are real scalars.
Basic Linear Algebra Subprograms Technical (BLAST) Forum (2001)
Basic Linear Algebra Subprograms Technical (BLAST) Forum Standard University of Tennessee, Knoxville, Tennessee
http://www.netlib.org/blas/blast-forum/blas-report.pdfThe BLAS standard requires accurate implementations which avoid unnecessary over/underflow (see Section 2.7 of
Basic Linear Algebra Subprograms Technical (BLAST) Forum (2001)).
Not applicable.
None.
This example computes the matrix-vector product
where