Afun: Matrix of correlations between two sets of points
Description
Returns the matrix of correlations of code output at each level
evaluated at points on the design matrix.
Usage
Afun(level, Di, Dj, hpa)
Arguments
level
The level. This enters via the correlation scales
Di
First set of points
Dj
Second set of points
hpa
Hyperparameter object
Author
Robin K. S. Hankin
Details
This is essentially a convenient wrapper for function
corr.matrix. It is not really intended for the end user.
References
M. C. Kennedy and A. O'Hagan 2000. “Predicting the output from
a complex computer code when fast approximations are available”
Biometrika, 87(1): pp1-13