Re: covariance branch update

[Jason Stover]

On Tue, May 18, 2010 at 07:14:11AM +0000, John Darrington wrote:
> Great!  Just one small thing I noticed:  You have a new static function 
> invert_r
> which isn't used.  Should this be deleted or do you have plans for it in the 
> future?

Thanks. I left invert_r in there because I thought I might use it in
the future.  I was going to use it in linreg_fit_qr, but found another
way to accomplish the same task with GSL. But now, I don't see any
definite use for the function in the future, so it could be removed.

I'll start on the merge.

-Jason