Description Usage Arguments Value Author(s)
The function computes the projection matrix onto a set of columns of a given matrix.
1 | projection(X, active = NULL)
|
X |
a matrix containing the columns onto which the projection matrix is computed. |
active |
an index set of the columns of X. |
Returns the projection matrix onto the columns of "X" whose indices are included in "active". When active==NULL, a null matrix is returned.
Haeran Cho
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