?? mat2var.m
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function vars = mat2var(Pmat)
% MAT2VAR Extract variance estimates from matrix of covariance estimates.
% The variance estimates (corresponding to the diagonal of a
% covariance matrix) are extracted from a matrix for which each
% row contains the upper triangular elements of a covariance matrix.
%
% varmat = mat2var(Pmat);
%
% Written by: Magnus Norgaard, IMM/IAU, Technical University of Denmark
% LastEditDate: Apr. 15, 2000
states = round(-0.5 + sqrt(0.25 + 2*size(Pmat,2)));
idx = cumsum ([1 states:-1:2]);
vars = Pmat(:,idx);
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