Plot of Probability Density function in MATLAB

I have time series data.I want to see the plot of PDF.For this, in MATLAB,I have to mention the name of the PDF-type like 'norm'.All PDF types are continuous line.But,I need discrete PDF data points plot.

Answer 1

[Wayne King]

Are you sure that you need a discrete PDF? You have not specified that your time series takes on values only in a discrete set, e.g. {0,1}.

Just because you have a discrete-time process, it can very well be that you should model the random variables as continuous.

For example:

x = randn(100,1);

gives a realization of a discrete-time white Gaussian noise process, but it is not a discrete random variable.

Do you have a specific pdf that you would like to assess for your data?

You can always use ksdensity to estimate the pdf

x = randn(100,1);
[f,xi] = ksdensity(x);
plot(xi,f);

If you want to see if your data follow a certain distribution, see histfit, or dfittool

Answer 2

[Keerthivasan Rajamani]

Maybe this could be helpful to consider:

histogram(variable_name,'Normalization','probability')

Answer 3

[Daniel Shub]

The pdf function can handle binomial, Poisson, and discrete uniform distributions, so not all of them are continuous.

Also are you sure you don't just want to do:

hist(x)

where x is your data?

Answer 4

[cheng wei chen]

不知道