MATLAB: A figure is created, but there is no plot

figureplot

Here is my coding,I get no errors and it produces a figure, just no plot. I want to plot amplitude vs speed, it will be constant so it should just be one line straight across.
clear all
clc
%%%given values
k=53.33;
omega=sqrt(k.*386/3330);
w=3330;
mprime=50/386;
wprime=50;
xi=0.1;
%%%create Array
speed=linspace(0,5000,500);
Fomega=speed.*2.*pi()/60;
Fo=mprime.*Fomega.^2;
r=Fomega/omega;
ust=Fo/k;
U=ust/sqrt(((1-r.^2).^2)+((2.*r.*xi).^2));
%%%Plot Response%%%
plot(speed,U, 'LineWidth', 2,'Color', [0 0 0]);
title ('Amplitude vs RPM')
%%%Label the X-Axis of the Plot%%%
xlabel('Speed (RPM)');
%%%Label the Y-Axis of the Plot%%%
ylabel ('Amplitude ');

Best Answer

You need to vectorise the division as well:
U=ust./sqrt(((1-r.^2).^2)+((2.*r.*xi).^2));
     ↑ ← INSERT ‘.’ HERE
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