isposdef.m

利用HMM的方法的三种语音识别算法

function b = isposdef(a)
% ISPOSDEF   Test for positive definite matrix.
%    ISPOSDEF(A) returns 1 if A is positive definite, 0 otherwise.
%    Using chol is much more efficient than computing eigenvectors.

%  From Tom Minka's lightspeed toolbox

[R,p] = chol(a);
b = (p == 0);