Mercurial > octave-nkf
changeset 7248:ffca9912dc82
[project @ 2007-12-04 17:17:39 by jwe]
| author | jwe |
|---|---|
| date | Tue, 04 Dec 2007 17:17:39 +0000 |
| parents | b689a67dbe88 |
| children | 87b5a3fb5286 |
| files | scripts/ChangeLog scripts/linear-algebra/krylov.m |
| diffstat | 2 files changed, 13 insertions(+), 1 deletions(-) [+] |
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--- a/scripts/ChangeLog Tue Dec 04 16:51:32 2007 +0000 +++ b/scripts/ChangeLog Tue Dec 04 17:17:39 2007 +0000 @@ -1,3 +1,8 @@ +2007-12-04 John W. Eaton <jwe@octave.org> + + * linear-algebra/krylov.m: Doc fixes. + From Marco Caliari <caliari@sci.univr.it>. + 2007-12-03 John W. Eaton <jwe@octave.org> * contour.m, contour3.m, contourc.m, contourf.m, cylinder.m,
--- a/scripts/linear-algebra/krylov.m Tue Dec 04 16:51:32 2007 +0000 +++ b/scripts/linear-algebra/krylov.m Tue Dec 04 17:17:39 2007 +0000 @@ -29,7 +29,14 @@ ## Using Householder reflections to guard against loss of orthogonality. ## ## If @var{v} is a vector, then @var{h} contains the Hessenberg matrix -## such that @code{a*u == u*h}. Otherwise, @var{h} is meaningless. +## such that @code{a*u == u*h+rk*ek'}, in which @code{rk = +## a*u(:,k)-u*h(:,k)}, and @code{ek'} is the vector +## @code{[0, 0, @dots{}, 1]} of length @code{k}. Otherwise, @var{h} is +## meaningless. +## +## If @var{v} is a vector and @var{k} is greater than +## @code{length(A)-1}, then @var{h} contains the Hessenberg matrix such +## that @code{a*u == u*h}. ## ## The value of @var{nu} is the dimension of the span of the krylov ## subspace (based on @var{eps1}).