Define a function and plot its min

General Discussion
1

Hi,
i want to plot with FF++, the following function
min_{mu > 0} (D * mu^3 * exp(mu * tau)}{(mu+sigma)*exp(mu * tau)-a * b * w0)

the data are: real tau=1, w0=1.0, sigma=1.0, D=0.001, a=0, b=2

then i try to do this:

real tau=1.0;
real w0=1.0;
real sigma=1.0;
real D=0.001;
real a=0.0;
real b=2.0;

func real F (real mu)
{
return (D * mu^3 * exp(mu * tau))/( (mu+sigma2) * exp(mu * tau)-a * b * w0);
};
func real F (real mu)=
{
return (D * mu^3 * exp(mu * tau))/( (mu+sigma2) * exp(mu * tau)-a * b * w0);
};
Vh Fh=F;

I have to plot minimum of F for mu > 0 (dont for all real mu). So how we define this minum?

Thank’s in advanced