I need help graphing a function.

The code creates a graph but I'm pretty sure it's wrong because It's supposed to look closer to a cos(x) graph

t=linspace(0,100,101);

y=(3.*((2.71828).^(-t./2))).*(cos(4.*pi.*t));

plot(t,y);

grid

Answer 1

[Star Strider]

It probably should be a decaying sinusoid.

The problem is that it decays too fast. Decreasing the magnitude of ‘t’ helps to visualise it correctly. (I suspect the problem is the ‘exp(-t./2)’ term. The constant should be smaller than 0.5 to get the result you lilely want with the original ‘t’.)

t=linspace(0,100,101)/10;
y = 3.*exp(-t./2).*cos(4.*pi.*t);
plot(t,y);
grid

.

[Brendan]

Thank you. That is exactly what i was looking for.

[Star Strider]

As always, my pleasure!