MATLAB: Plotting sine wave for a ODE Problem

MATLABodeplotting

Hello all, I need some help on trying to plot these as a sine wave curve in Matlab, but can't seem to figure out how. Here's what I have:

t=0:5

r1=[(9.81/16)-(2.40/4)]*exp(-2*t)+(9.81/8)*sin(2*t);

r2=[(9.81/16)-(2.45/4)]*exp(-2*t)+(9.81/8)*sin(2*t);

r3=[(9.81/16)-(2.50/4)]*exp(-2*t)+(9.81/8)*sin(2*t);

figure(1) plot(t,r1) grid on

figure(2) plot(t,r2) grid on

figure(3) plot(t,r3) grid on

They are in the right plot and looks. But can't seem to get them into the sine wave curve I need them in. Any help would be great. Thanks.

Best Answer

Use the linspace function to define ‘t’:

t = linspace(0,5);

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On my system, Maple ran out of memory trying to solve() that equation. There is a possibility that a system with more memory might be able to arrive at an answer, given enough time.

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MATLAB: Plot 2D graph

Put all the graphs on a single figure:

x=-2*pi:0.04:2*pi;
figure;
plot(x,sin(x),'r');
hold on;
plot(x,2*sin(x),'b');
plot(x,3*sin(x),'g');
plot(x,5*sin(x),'c');
plot(x,sin(2*x),'y');
plot(x,sin(3*x),'m');
plot(x,sin(5*x),'k');
grid on;
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To make individual graphs:

figure:
plot(x,sin(x),'r');
grid on;
title('Sin(x)');

Next figure:

figure;
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title('2*Sin(x)');

etc.

Best Answer

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