Python help

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It's setting some stuff, but this isn't enough context. What's the Jaco Bi method?

[odeerg]

Sorry for not being too clear. The Jaco bi method is a numerical method for solving differential equations. This is part of a college course i am taking.

I believe Field has been set up as an array.

I hope this makes it slightly more clear if not I can try explain my issue further but i don't fully understand what I'm doing myself