HELP!
I am writing a program that computes integrals using the Runge-kutta 4th order.

my equation is $$\theta$$'' + b * $$\theta$$' + sin($$\theta$$) = F*cos(wt)

where b, F, w, and t are given values.

I am supposed to output $$\theta$$ and $$\theta$$' for changes in t(time) but my problem comes from the fact that my function parameters are unknown.

Here is a sample of my code:

double t=0, wd=0.66, b=0.25, F=1.5, theta,
h=2*(pi)/100, maxTime;
double k1,k2,k3,k4;

for(t=t; t

Question

HELP!
I am writing a program that computes integrals using the Runge-kutta 4th order.

my equation is $$\theta$$'' + b * $$\theta$$' + sin($$\theta$$) = F*cos(wt)

where b, F, w, and t are given values.

I am supposed to output $$\theta$$ and $$\theta$$' for changes in t(time) but my problem comes from the fact that my function parameters are unknown.

Here is a sample of my code:

double t=0, wd=0.66, b=0.25, F=1.5, theta,
		h=2*(pi)/100, maxTime; 
double k1,k2,k3,k4;

for(t=t; t<maxTime; t=t+h)
	{
		k1=h*f(wd, b, F, theta);
                   ........................

anonymous · Answer

double f(double wd, double b, double F, double theta)
{

anonymous · Answer

I don't think it's possible, you should express theta as 
theta = blablabla