Asked by sphinx mo
on 4 Oct 2012

Hy,

I have two value one is for mean and another Standard deviation. how i can plot PDF for it ?

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Answer by Wayne King
on 4 Oct 2012

Edited by Wayne King
on 4 Oct 2012

Accepted answer

That very much depends on the PDF. For some distributions, the mean itself is necessary and sufficient (like the exponential), for others the mean and standard deviation are necessary and sufficient (the Gaussian), and for still others the distribution is not parametrized by the mean and std. If this is Gaussian, then I'll assume mu is the mean and sigma the standard deviation.

mu = 10; sigma = 1.5; x = mu-(4*sigma):0.01:mu+(4*sigma); y = normpdf(x,mu,sigma); plot(x,y)

So basically you really need to know which PDF you have the first moment (mean) and second central moment (variance) of.

Wayne King
on 4 Oct 2012

Opportunities for recent engineering grads.

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