Stdev from gmdistribution.fit?

I'm using function gmdistribution.fit to fit data which is a mixture of three normal distributions with different means and different stdevs. The function returns the mean of each component distribution all rigth, but I need also the estimated standard deviation of each distribution. How can I get that? It doesn't seem to be returned. Thanks

Answer 1

[the cyclist]

According to the example on this page: http://www.mathworks.com/help/stats/gmdistribution.fit.html, if

obj = gmdistribution.fit(...)

then

obj.Sigma

has the covariance matrix.