How to plot Normal probability density function?

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Nisar Ahmed
Nisar Ahmed 2021-9-3
评论： Star Strider 2025-2-6
Hi
I am plotting probability density function by using this command:
mx = mean(RMS_vp); sx = std(RMS_vp); norm_vp = normpdf(RMS_vp,mx,sx);
The problem is shown in the attached figure. First, it do not touches the x axis at left side. Second, when I plot it as solid line (see the image in the center, a lot lines appears as zoom in (blue image).
How can I solve these issues?

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Star Strider
Star Strider 2021-9-3
Try something like this:
RMS_vps = sort(RMS_vp);
norm_vp = normpdf(RMS_vp,mx,sx);
figure
plot(RMS_vps, norm_vp)
alternatively:
RMS_vpe = linspace(mx-5*sx, mx+5*sx, 250);
norm_vpe = normpdf(RMS_vpe,mx,sx);
figure
plot(RMS_vpe, norm_vpe)
One (or both) of those should do what you want.
.
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Karam
Karam 2025-2-6
Thank you very much! The first code helped me with this!

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