A named list of observations, given in the usual form.
points
A list of points at which the emulators should be evaluated.
npoints
If no points are provided, the number of input points to evaluate at.
Details
If a points data.frame is not provided, then points are sampled uniformly from the
input region. Otherwise, the provided points are used: for example, if a representative
sample of the current NROY space is available.