schur | R Documentation |
Obtain generalized Schur complement
schur(M, x, y, z)
M |
symmetric positive definite matrix |
x, y, z |
indices of M to calculate with (see below) |
Calculates M_{xy} - M_{xz} M^{zz} M_{zy}, which (if M is a Gaussian covariance matrix) is the covariance between x and y after conditioning on z.
y defaults to equal x, and z to be the complement of x \cup y.
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