How to plot Normal probability density function?

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?

[Chunru]

Can you post your code?

Answer 1

[Star Strider]

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.

.

[Nisar Ahmed]

Thanks @Star Strider, the second one is working.

[Star Strider]

As always, my pleasure!

.

[Karam]

Thank you very much! The first code helped me with this!

[Star Strider]

My pleasure!

A Vote would be appreciated!