Periodic functions show up as a straight line
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Hello everyone!
When I plot the multiplots in one figure, only x1 shows up as a true graph of a periodic function, the rest shows up as straight lines. It is true for x0 as a straight line as it is a constant function. What goes wrong in my code? Thank you in advance.
t = 0:0.000001:2;
x0 = 0.0507*cos(0*pi*t);
figure
plot(t,x0)
set(gca,'fontsize',13)
title('Plot 1:Spanning over one period')
hold on
x1 = 0.645*cos(pi*t - 3.14/2);
plot(t,x1)
x3 = 0.00057*cos(3*pi*t - 3.116);
plot(t,x3)
x5 = 0.0000684*cos(5*pi*t - 3.126);
plot(t,x5)
legend('x0','x1','x3','x5')
xlabel('time t (second)')
ylabel('x(t) in meter')
hold off
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KSSV
2017년 11월 2일
All expect x0 periodic functions.....but the amplitude of them is low....compared to the amplitude of x1....that's why it shows up like straight line.
답변 (1개)
Walter Roberson
2017년 11월 2일
You have
x0 = 0.0507*cos(0*pi*t);
which is going to be cos(0) * 0.0507 = 0.0507 for all t -- a straight line.
You have
x1 = 0.645*cos(pi*t - 3.14/2);
which successfully plots as expected.
You have
x3 = 0.00057*cos(3*pi*t - 3.116);
which has a maximum amplitude of 0.00057 which is too small an amplitude change to show up unless you zoom in.
You have
x5 = 0.0000684*cos(5*pi*t - 3.126);
which is about an 8 time smaller amplitude yet, and would need even more zooming in to so.
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