MATLAB: Calculating PDF from data set

Question

I have a random variable k whose size is (1000*1), I want to draw a PDF curve for its values over a range x.

I tried this line:

pdf_normal = pdf('Normal',k,x);

But it return an array all of its values are NaN.

How can I fix that? or is there another way to get what I want?

Note:

k and x have the same size.

Answer 1

That is likely not the appropriate initial function. The fitdist function would likely do what you want. Then, use the pdf function on the output of fitdist.

Example —

k = randn(1000,1);                                  % Create ‘k’
x = linspace(-5,5);                                 % Create ‘x’
pd = fitdist(k, 'Normal');
y = pdf(pd,x);
figure
plot(x, y)
grid
xlabel('x')
ylabel('PDF')

.