: Wednesday, September 12, 2007 3:01 AM
To: Keith Dunnigan
Cc: r-sig-geo@stat.math.ethz.ch
Subject: Re: [R-sig-Geo] Positive Definite Covariance Matrix for Grid
Sampled Data
Keith, read my suggestion good; I didn't suggest replacing all zeroes in
the distance matrix! You either rearrange point
sig-geo@stat.math.ethz.ch
> Subject: Re: [R-sig-Geo] Positive Definite Covariance Matrix for Grid
> Sampled Data
>
> Keith,
>
> indeed kriging usually fails when one or more point pairs have zero
> distance. One solution in terms of distances would be to shift these
> points a
numbers up to 5, with no
luck.
Anyone have any other ideas?
Keith
- Original Message-
From: Edzer J. Pebesma [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 11, 2007 2:30 PM
To: Keith Dunnigan
Cc: r- sig- [EMAIL PROTECTED]
Subject: Re: [R- sig- Geo] Positive Definite Covariance Mat
luck.
Anyone have any other ideas?
Keith
-Original Message-
From: Edzer J. Pebesma [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 11, 2007 2:30 PM
To: Keith Dunnigan
Cc: r-sig-geo@stat.math.ethz.ch
Subject: Re: [R-sig-Geo] Positive Definite Covariance Matrix for Grid
Sampled Data
Keith,
indeed kriging usually fails when one or more point pairs have zero
distance. One solution in terms of distances would be to shift these
points a bit, such that no zero distances occur anymore. In terms of the
covariances, the solution would be to lower the corresponding
off-diagonal en
Hello all,
First I would like to apologize if this question is inappropriate for
this list. I am new here, I found this list doing a web search and it
seemed like the members here would have knowledge in this area. If
there are more appropriate lists of forums for this question, I would
app
