function R = cov2cor(S)
% usage: R = cov2cor(S)
% description: computes the correlation matrix
% R from the input covariance matrix S, assuming
% all diagonal entries of S are positive.

% programmer: t. shores       last rev: 8/09/07

Dinv = diag(diag(S))^(-0.5);
R = Dinv*S*Dinv;