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

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

Accepted Answer

Cris LaPierre
Cris LaPierre on 21 Oct 2021
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);

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