function [h] = plotgaus( mu, sigma, colspec );

% PLOTGAUS 啊快矯救 牧捧絹 弊妨焊扁
%
%    PLOTGAUS(MU,SIGMA,COLSPEC)
%    MU : 乞閉 
%    SIGMA : 傍盒魂
%    禍彬瘤瀝牢磊 COLSPEC = [R,G,B].
%    PLOTGAUS(MU,SIGMA)老 版快, 叼棄飄 禍惑籃 [0 1 1] (cyan).
%

if nargin < 3; colspec = [0 1 1]; end;
npts = 100;

stdev = sqrtm(sigma);

t = linspace(-pi, pi, npts);
t=t(:);

X = [cos(t) sin(t)] * stdev + repmat(mu,npts,1);

h(1) = line(X(:,1),X(:,2),'color',colspec,'linew',2);
h(2) = line(mu(1),mu(2),'marker','+','markersize',10,'color',colspec,'linew',2);