Okay, I'm trying to play around again :D(adsbygoogle = window.adsbygoogle || []).push({});

A little overview; I know that the Poisson equation is supposed to be:

u_{xx}+ u_{yy}= f(x,y)

I can manage to discretise the partial derivative terms by Taylor. I don't know how to deal with the f(x,y) though. Say for example, u_{xx}+ u_{yy}= -exp(x). what values of x will I use?

If possible, by virtue of this Laplace equation solution diagram,

https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-prn2/q71/1533880_710799648952993_1272413896_n.jpg

which values of x will I use, is it the 30's or the 100's? If I add y in f(x,y) as well (perhaps changing the equation to -exp(x+y) as an example), which values of y should I use? is it the 50's or the 100s at the right side? Thanks a lot. :D

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# Poisson PDE discretisation help!

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