Re: [R] vectorization instead of using loop

2008-10-09 Thread Richard . Cotton
Frank said: > > This piece of code works, but it is very slow. We were wondering if it's > at > > all possible to somehow vectorize this function. Any help would be > greatly > > appreciated. Richie said: > You can save a substantial time by calling as.matrix before the loop Patrick said: > On

Re: [R] vectorization instead of using loop

2008-10-09 Thread Richard . Cotton
> I've sent this question 2 days ago and got response from Sarah. Thanks for > that. But unfortunately, it did not really solve our problem. The main issue > is that we want to use our own (manipulated) covariance matrix in the > calculation of the mahalanobis distance. Does anyone know how to v

Re: [R] vectorization instead of using loop

2008-10-09 Thread Patrick Burns
One thing that would speed it up is if you inverted 'covmat' once and then used 'inverted=TRUE' in the call to 'mahalanobis'. Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and "A Guide for the Unwilling S User") Frank Hedler wrote: Dear all, I'v