RECURRENCE PLOTS

Hello, I need to calculate joint probability of reccurence, so first I have to calculate delayed JRP. According to Norbert's article I have found, I have to calculate delayed reccurence matrix R[i+t,j+t]. My matlab code: d = 15; S= zeros(N-d); for i= 1 : N-d for j = 1 : N-d S(i+d,j+d) = sqrt(sum((x(...