Mercurial > octave
changeset 24553:6e81c8a5add7 stable
doc: Correct errors in Diagonal matrix chapter of manual (bug #52814).
* diagperm.txi: Correct definition of multiplication when rows exceeds columns.
Use parentheses to accurately show how to solve A*x = b using LU decomposition.
| author | Rik <rik@octave.org> |
|---|---|
| date | Sun, 07 Jan 2018 21:40:02 -0800 |
| parents | ba8b828ee4f2 |
| children | cd42d0f341db a3a263a26aab |
| files | doc/interpreter/diagperm.txi |
| diffstat | 1 files changed, 3 insertions(+), 3 deletions(-) [+] |
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--- a/doc/interpreter/diagperm.txi Sun Jan 07 08:26:41 2018 -0800 +++ b/doc/interpreter/diagperm.txi Sun Jan 07 21:40:02 2018 -0800 @@ -275,7 +275,7 @@ then @code{D*M} is equivalent to @example -[D(1:n,n) * M; zeros(m-n, columns (M))], +[D(1:n,:) * M; zeros(m-n, columns (M))], @end example @noindent @@ -447,7 +447,7 @@ @example @group [L, U, P] = lu (A); ## now L*U = P*A - x = U \ L \ P*b; + x = U \ (L \ P) * b; @end group @end example @@ -526,7 +526,7 @@ The primary distinction is that an assumed zero, when multiplied by any number, or divided by any nonzero number, -yields *always* a zero, even when, e.g., multiplied by @code{Inf} +yields @strong{always} a zero, even when, e.g., multiplied by @code{Inf} or divided by @code{NaN}. The reason for this behavior is that the numerical multiplication is not actually performed anywhere by the underlying algorithm; the result is