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[ss3]

Hi,

How do I obtain a taylor expansion and thus the approximation for a function f(x, y)? Should I use the partial derivative wrt to x or the one wrt to y?

Thanks to anyone who can help me with this..

[joerd]

You can do a Taylor expansion for one variable around one value, e.g. x0. So in that case y is assumed constant and you take the partial derivatives with respect to x. Alternatively, you can expand around y0 with respect to y. I suppose if you add the two series, you get a function 2*f(x,y) - but I am not a mathemagician. Note that it will be an approximation, and it gets worse if you try to do it in two dimensions.