Description Usage Arguments Value Author(s) See Also
View source: R/buildKrigingDACE.R
General exponential correlation function.
If n > 1
and length(theta) = 1
, then the model is isotropic:
theta_j = theta[1], j=1,...,n; theta_[n+1] = theta[2]
.
1  correxpg(theta, d, ret = "all")

theta 
parameters in the correlation function 
d 
m*n matrix with differences between given data points 
ret 
A string. If set to 
returns a list with two elements:

correlation 

m*n matrix with the Jacobian of 
The authors of the original DACE Matlab code http://www2.imm.dtu.dk/projects/dace/
are Hans Bruun Nielsen [email protected], Soren Nymand Lophaven and Jacob Sondergaard.
Ported to R by Martin Zaefferer [email protected].
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