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Shahriar
01/10/09 5:35pm

Here is a simple case from my previous post that id like to solve.

y''[x]==y+z'[x]
z[x]^3=y'[x]+3

With boundary conditions of y[1]==2 and y[0]==3

Using NDSolve on these equations, Mathematica says the order of the equations is 3 and it has only 2 initial conditions. But the order of this system of equations is 2 as far as I see (since order is defined as the highest derivative)

When I do try to put another boundary condition in like z[0]==0 Mathematica spits out that it cant solve for the derivatives and is using a mass matrix method (error:ntdvmm) and then it says that it has significant errors (error:berr) and will return the best solution found.

Any help on this matter will be greatly appreciated.
Thanks

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Subject (listing for 'Solving coupled nonlinear differential eqns(sim...')
Author Date Posted
Solving coupled nonlinear differential eqns(sim... Shahriar 01/10/09 5:35pm
Re: Solving coupled nonlinear differential eqns... Tom 01/12/09 11:15pm
Re: Re: Solving coupled nonlinear differential ... Shahriar 01/13/09 12:18pm
Re: Solving coupled nonlinear differential eqns... Kaveh 01/19/09 5:03pm
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