[Pspp-commits] [SCM] GNU PSPP branch, master, updated. v0.6.1-63-gceb0823

[Jason H Stover]

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- Log -----------------------------------------------------------------
commit ceb0823669b8cb6784fd4f793d28451e33dfd512
Author: Jason H Stover <address@hidden>
Date:   Wed Oct 15 10:06:50 2008 -0400

    covariance_accumulate: New function for one-pass computation of the
    covariance matrix.
    
    Added hash table to temporarily store the elements that will be in the
    covariance matrix. The hash consists of the new data structure
    covariance_accumulator. New functions hash_numeric_alpha,
    covariance_accumulator_compare, match_nodes,
    covariance_accumulator_free, covariance_hsh_create,
    covariance_accumulator_hash, to assist with the hashing.
    
    update_product: New function.
    
    covariance_accumulator_to_matrix: New function to put hash elements
    into the covariance matrix.
    
    get_center: New function to center a value prior to adding it to
    the covariance matrix.
    
    covariance_matrix_insert: New function to add a value to the
    covariance matrix.

-----------------------------------------------------------------------

Summary of changes:
 src/math/covariance-matrix.c |  396 +++++++++++++++++++++++++++++++++++++++++-
 src/math/covariance-matrix.h |   13 ++-
 2 files changed, 404 insertions(+), 5 deletions(-)


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