Mercurial > hg > octave-terminal
changeset 15464:930117c97760
mean.m: improve geometric mean algorithm for small numbers. Add test.
author | Jordi Gutiérrez Hermoso <jordigh@octave.org> |
---|---|
date | Mon, 01 Oct 2012 12:38:07 -0400 |
parents | 6a05cad5b694 |
children | ded4ce76ee7a |
files | scripts/statistics/base/mean.m |
diffstat | 1 files changed, 8 insertions(+), 1 deletions(-) [+] |
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--- a/scripts/statistics/base/mean.m +++ b/scripts/statistics/base/mean.m @@ -113,7 +113,11 @@ if (strcmp (opt, "a")) y = sum (x, dim) / n; elseif (strcmp (opt, "g")) - y = prod (x, dim) .^ (1/n); + if (all (x(:) >= 0)) + y = exp (sum (log (x), dim) ./ n); + else + error ("mean: X must not contain any negative values"); + endif elseif (strcmp (opt, "h")) y = n ./ sum (1 ./ x, dim); else @@ -131,6 +135,9 @@ %! assert (mean (y), 0); %! assert (mean (z), [0, 10]); +## Test small numbers +%!assert (mean (repmat (0.1,1,1000), "g"), 0.1, 20*eps) + %!assert (mean (magic (3), 1), [5, 5, 5]) %!assert (mean (magic (3), 2), [5; 5; 5]) %!assert (mean ([2 8], "g"), 4)