Taylor expansion with 2 variables

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Weia Reinboud
Weia Reinboud 2018-7-2
回答： Weia Reinboud 2018-7-3
I have a long function and want to know its Taylor expansion, but it's a function with 2 variables f(g,h). I expect a summation of a Taylor series in g and one in h. The documentation contains something like that, but I do not see how to do it. In which screen expansions pop up?

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回答（2 个）

Anton Semechko
Anton Semechko 2018-7-2
Taylor's theorem generalizes to multivariate functions. Formula for third order approximation of a bivariate function can be found here , under the heading "Example in two dimensions".
Weia Reinboud
Weia Reinboud 2018-7-3
I overlooked 'syms'. So it works now. But now I have a new problem, the expansion is over 25000 signs long, too long for the command window. And too long for my goal. I have to do some rethinking...

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