If a dimension reduction object has p dimension, returns a p \times r matrix whose columns space a subspace specified by a formula.
A one-sided formula, see below
either +1 or -1; see below
The workings of this function is best explained by an example. Suppose
dr object was created with the formula
we have p=4 predictors. A matrix that spans the subspace of
by Span(x1,x2,x3,x4) is simply the identity matrix of order 4.
This function will return a subset of the columns of this identity matrix,
as determined by
spec. For example, if
spec = ~.-(x3+x4), the
function returns the columns corresponding to x1 and x2 if
which=+1 or the
columns corresponding to x3 and x4 if which=-1. Similarly, if
spec=~x1+x2, the same matrices will be returned.
A matrix corresponding to the value of
Sanford Weisberg, email@example.com
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