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matlabplotnormal-distributionprobability-densityprobability-distribution

Plotting a Normal Distribution in Matlab

Is this a good way of plotting a Normal Distribution? On occasion, I get a pdf value (pdf_x) which is greater than 1.

% thresh_strain contains a Normally Distributed set of numbers
[mu_j,sigma_j] = normfit(thresh_strain);   
x=linspace(mu_j-4*sigma_j,mu_j+4*sigma_j,200);   
pdf_x = 1/sqrt(2*pi)/sigma_j*exp(-(x-mu_j).^2/(2*sigma_j^2));   
plot(x,pdf_x);

enter image description here

Solution

  • The integral of a pdf is 1, at any point the values can be higher. Your plot is corect.