gsl_stats_wcovariance

[Brian Gough]

James Bergstra writes:
 > Please find attached (if the mailing list supports attachments) the files that I
 > modified.  They are from the statistics subdirectory of today's cvs.  In
 > addition to rewriting wcovar_source.c, I added wcovariance declarations to
 > headers (double, float, long double) and added wcovar.c to Makefile.am.  Also
 > attached is a very simple test program.  This program's output agrees with the
 > cov.wt routine from R.

That's good, we do need tests before adding anything.

-- 
Brian Gough