Logical. If TRUE, the character vectors colnames(X)
and inputNames(object) must be the same sets, and hence have
the same length. If FALSE the vector
inputNames(object) must be a subset of colnames(X)
which then can have unused columns.
...
Not used yet.
Details
The matrix X must have the number of columns expected from the
covariance kernel object description, and it must have named columns
conforming to the kernel inputnames as returned by the
inputNames method. If the two sets of names are identical but
the names are in a different order, the columns are permuted in order
to be in the same order as the inputnames. If the names sets differ,
an error occurs.
Value
A matrix with columns names identical to the inputnames attached with
the kernel object, i.e. inputNames(object). The columns are copies
of those found under the same names in X, but are put in the order of inputNames(object).
When an input name does not exist in colnames(X) an error occurs.
providing 
.