taux_passages_zeros(result, windowsize)

function [taux_zeros] = taux_passages_zeros(result, windowsize)
% taux de passages par zero
s = size(result);
y1 = [zeros(1, s(2)); result];
y2 = [result; zeros(1, s(2))];
taux_zeros = sum(abs(sign(y1)-sign(y2))/2)/windowsize;