PDF (Probability Density Function) of a 2D matrix of values

I have a 2D matrix of values in .csv text file format (see the file attached) and I want to make a plot of the PDF (Probability Density Function) of these values. How could I do this? Thank you in advance.

Answer 1

[Tom Lane]

If you have your data in the matrix M and you want to ignore the zeros and the relative locations of the values, you could try

    histogram(M(M>0))

If you want to fit a distribution such as log-logistic, you could try

    p = fitdist(M(M>0),'loglogistic')