# HG changeset patch
# User jwe
# Date 1196788659 0
# Node ID ffca9912dc82ec42f24a4f41eff4608f50c942ea
# Parent  b689a67dbe884f09e4e5178413b8be9b8dcd94d2
[project @ 2007-12-04 17:17:39 by jwe]

diff -r b689a67dbe88 -r ffca9912dc82 scripts/ChangeLog
--- 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,
diff -r b689a67dbe88 -r ffca9912dc82 scripts/linear-algebra/krylov.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}).