# Overlaying three functions on a single plot

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Peter Bohlen el 13 de Mayo de 2024
% Peter Daniel Bohlen
% Mech3080 hw2
% Part 2E
t = 0: 0.01:6;
x = (6 * exp(-0.5 * t)) * cos((5 * pi * t) + (pi/4));
y = -1.5 * sin(5.5 * pi *t);
z = (6 * exp(-0.5*t))* cos((5 * pi *t) + (pi/4)) - (1.5 * sin(5.5 * pi *t));
plot (t,x)
plot(t,y)
plot(t,z)
grid on
xlabel 'Time (sec)'
ylabel 'Displacement (in)'
title 'Homework 2 Part 2E - Displacement vs. Time'
it is returning an error of this :
Error in hw2part2E (line 6)
x = (6 * exp(-0.5 * t)) * cos((5 * pi * t) + (pi/4));
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Voss el 13 de Mayo de 2024
To avoid the error, use element-wise multiplication (.*), because * is for matrix multiplication.
To plot multiple functions in a single plot, use hold on.
% Peter Daniel Bohlen
% Mech3080 hw2
% Part 2E
t = 0: 0.01:6;
x = (6 * exp(-0.5 * t)) .* cos((5 * pi * t) + (pi/4));
% ^^ element-wise
y = -1.5 * sin(5.5 * pi *t);
z = (6 * exp(-0.5*t)).* cos((5 * pi *t) + (pi/4)) - (1.5 * sin(5.5 * pi *t));
% ^^ element-wise
figure
hold on
plot (t,x)
plot(t,y)
plot(t,z)
grid on
xlabel 'Time (sec)'
ylabel 'Displacement (in)'
title 'Homework 2 Part 2E - Displacement vs. Time'
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Peter Bohlen el 13 de Mayo de 2024
Thank you very much!
Voss el 13 de Mayo de 2024
You're welcome! Any questions, let me know. Otherwise, please "Accept" this answer. Thanks!

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