Mercurial > hg > octave-lyh
changeset 3190:70eb3f4136cd
[project @ 1998-10-19 22:37:56 by jwe]
| author | jwe |
|---|---|
| date | Mon, 19 Oct 1998 22:37:57 +0000 |
| parents | bef7b73c0724 |
| children | e4f4b2d26ee9 |
| files | scripts/ChangeLog scripts/polynomial/polyfit.m |
| diffstat | 2 files changed, 6 insertions(+), 11 deletions(-) [+] |
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--- a/scripts/ChangeLog +++ b/scripts/ChangeLog @@ -1,3 +1,8 @@ +Mon Oct 19 17:26:35 1998 John W. Eaton <jwe@bevo.che.wisc.edu> + + * polynomial/polyfit.m: Just use the \ operator to handle the + least-squares solution. + Thu Sep 3 12:40:47 1998 John W. Eaton <jwe@bevo.che.wisc.edu> * strings/str2num.m: If eval returns a string, return an empty matrix.
--- a/scripts/polynomial/polyfit.m +++ b/scripts/polynomial/polyfit.m @@ -51,19 +51,9 @@ x = reshape (x, l, 1); y = reshape (y, l, 1); - ## Unfortunately, the economy QR factorization doesn't really save - ## memory doing the computation -- the returned values are just - ## smaller. - - ## [Q, R] = qr (X, 0); - ## p = flipud (R \ (Q' * y)); - - ## XXX FIXME XXX -- this is probably not so good for extreme values of - ## N or X... - X = (x * ones (1, n+1)) .^ (ones (l, 1) * (0 : n)); - p = (X' * X) \ (X' * y); + p = X \ y; if (nargout == 2) yf = X * p;