Hi Vahid,
It is my understanding that you attempt to find the angle between the line formed by joining two adjacent points and the x-axis. Also use that to find angle between lines formed by every pair of adjacent points. The angle with the x-axis or the horizontal can be calculated as shown below, assuming B is the input Vector,
angle = zeros(length(B)-1,1); % Pre-allocating angles vector
for i = 1:(length(B)-1)
x = [i i+1];
y = [B(i) B(i+1)];
slope = (y(2) - y(1))/(x(2)-x(1));
angle(i) = atand(slope); % Angle in degrees
end
Angle between the lines can be calculated by simply subtracting the values in the angle vector.
angle1 = angle(2) - angle(1);
Thanks
Kiran
