i am trying nonlinear for nonlinear ode using by finite difference method

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Otgondorj
Otgondorj 2023-3-17
编辑： Otgondorj 2023-3-18
Ran in:
i am trying nonlinear for nonlinear BVP using by finite difference method.
y''+a*e^y=0, y(0)=y(1)=0.
The difference equations:
\frac{y_{i+1}-2y_i+u_{i-1}}{h^2}+a* e^{y_i}=0, i=1,\dots, n-1,
Code:
maxiter=4;
lamb=1;
n=20;
Unrecognized function or variable 'df'.

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回答（1 个）

Torsten
Torsten 2023-3-17
编辑：Torsten 2023-3-17
You want to solve a nonlinear system of equations using Newton's method, but you didn't supply the Jacobian "df". i.e.
df{i}/dx(j) (i,j = 2,...,n-1).

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