Given a Gaussian Markov random field defined by a precision matrix Q, this returns Phi, which is the precision matrix of the nodes indexed by 'obs.idx', computed using the Schur complement.
A precision matrix
A vector of unique indices of observed nodes in the graph defined by Q.
A square matrix of dimension equal to the length of 'obs.idx'.
Ephraim M. Hanks
Hanks and Hooten 2013. Circuit theory and model-based inference for landscape connectivity. Journal of the American Statistical Association. 108(501), 22-33.
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