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[Pspp-commits] [SCM] GNU PSPP branch, covariance, updated. v0.6.1-860-g3

From: John Darrington
Subject: [Pspp-commits] [SCM] GNU PSPP branch, covariance, updated. v0.6.1-860-g3bbe45f
Date: Sat, 17 Oct 2009 09:18:11 +0000

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU PSPP".

The branch, covariance has been updated
       via  3bbe45fcc70f8d059b4bf6715d629209b50fa48e (commit)
      from  09e9433298a484353b1aac68018871553bee3d55 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
commit 3bbe45fcc70f8d059b4bf6715d629209b50fa48e
Author: John Darrington <address@hidden>
Date:   Sat Oct 17 11:12:56 2009 +0200

    Add a two pass algorithm to calculate covariance matrices.
    The single pass algorithm, although faster, is numerically unstable.
    Furthermore, at can't reasonably be achieved when categorical variables
    are involved.    This change implements a two pass algorithm and allows
    the caller to choose which algorithm (s)he prefers.


Summary of changes:
 src/language/stats/correlations.c |   14 ++-
 src/math/covariance.c             |  221 +++++++++++++++++++++++++++++++++++--
 src/math/covariance.h             |    6 +-
 3 files changed, 230 insertions(+), 11 deletions(-)


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