zerocrossing This function estimates the points at which a given waveform y=y(x) crosses the x-axis using linear interpolation. w = zerocrossing (x, y) w: vector of points at which the function y(x) crosses x-axis. y: The dependant variable,y(x) x: The independant variable This function estimates the points at which a given waveform y = y(x) crosses the x-axis. It uses linear interpolation. x = linspace(0,2,200); y = 2*sin(2*%pi*x); x0= zerocrossing(x,y); y0=interp1(x,y,x0) plot(x,y,x0,y0,'x')