just signed up and can't figure it out as it says :"Error using plot Vectors must be the same length."

clear

clc

x = 0:pi/16:2*pi;

f = (sin(x).^2).*cos(2*x);

k = diff(f);

plot(x,k);

Answer 1

[Cris LaPierre]

The result of diff is a vector (you named it k) that has one element less than the input vector (you named it f). The error message, then, is that you inputs to the plot function are not the same length.

Try this.

x = 0:pi/16:2*pi;
f = (sin(x).^2).*cos(2*x);
k = [0 diff(f)];
plot(x,k);

[Abdallah Almughrabi]

Thank you so much!