How to use find function to find consistent value in column?

How do I find when a value in a matrix is the same (+ or - 5%) for say 20 rows?

I have this code so far:

%% Find start of jump

      st = find(mydata(:,5),

but I don't know how to finish the find function of to find when the value of the rows is constant (+ or - 5%) for 20 rows for example.

Answer 1

[Sean de Wolski]

Look at diff() This will tell you the difference between rows.