Solving a coupled ODE in Matlab using matrices

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Peter
Peter 2012-3-21
Hi,
I have a system of coupled differential equations that I am trying to solve in matlab. The number of equations can range between 6 and 600, so I decided to use matrices.
Essentially, what I am trying to solve is:
dx/dt+Ax=B
Where: - X is a 600x1 vector - A is a 600x600 matrix, and - B is a 600x1 vector
I have written a matlab program to input the matrices A and B, and then attempted to use ode23 to solve f=B-A*x, however it is telling me it will take millions of years to solve.
Please let me know if you require any more information.
Any help is greatly appreciated.
Cheers, Peter

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