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is it a stiff ODE?

is it a stiff ODE?# Computation - 科学计算

m*n2003-11-24 08:11

1 楼

D[F[r],r]=1-U[r] Sin[F[r]]^2 (0=Initial condition F[0]=0
U[r]=-400 Exp[-r*r/E]/Abs[E]+L*(L+1)/r^2+1-sgn[E]
where L>=0,E is a constant
Is Eq. (1) a stiff ODE?

d*q2003-11-24 08:11

2 楼

ode23...test it

【在 m****n 的大作中提到】

: D[F[r],r]=1-U[r] Sin[F[r]]^2 (0=: Initial condition F[0]=0
: U[r]=-400 Exp[-r*r/E]/Abs[E]+L*(L+1)/r^2+1-sgn[E]
: where L>=0,E is a constant
: Is Eq. (1) a stiff ODE?