normalization issue pdf gmm matlab

I plotted a histogram normalized by pdf. I den fitted GMM model using fitgmdist. I then plotted the pdf of gmm over histrogram . I found pdf way too higher than the normalized histogram values. kindly help. I am attaching the data

options = statset('Display','final');

gmdist = fitgmdist(data',3,'CovType','diagonal','Regularize', 1e-5)

gmsigma = sqrt(gmdist.Sigma);

gmmu = gmdist.mu;

gmwt = gmdist.ComponentProportion;

histogram(data, 'Normalization', 'pdf', 'EdgeColor', 'none')

x = -5:0.0001:30;

xlim([-5 30])

hold on;

plot(x', pdf(gmdist, x'), 'k')

hold on;

[Torsten]

I think the histogram is much too low ...

[Torsten]

@intesaaf ashraf comment moved here:

ok but why histogram is so low then

Answer 1

[Tom Lane]

You have a substantial amount of missing (NaN) data. I believe the histogram function produces a density that integrates to the proportion of missing values. That is, part of the pdf is allocated to the NaN values so is not shown. Try this instead:

histogram(data(~isnan(data)), 'Normalization', 'pdf', 'EdgeColor', 'none')

[Torsten]

@intesaaf ashraf comment moved here

thanks a lot