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Question: How to increase performance on a Taylor expansion procedure ?

Question:How to increase performance on a Taylor expansion procedure ?

C1Ron 60
performance procedure
May 22 2022
0

For an N'th order truncated multivariable Taylor series expansion for f(x,y) about (x0,y0), you can write

f := (x,y) -> 1/(2 + x*y^2):
P := (x,y,x0,y0,N) -> add(1/factorial(n)*add(binomial(n,k)*D[1$(n-k),2$k](f)(x0,y0)*
(x-x0)^(n-k)*(y-y0)^k, k=0..n), n=0..N):

The procedure works well, but it is slow for large orders.

Comparing with Maple's mtaylor function:

temp.mw

The built-in mtaylor is ~1400 times faster at N=30, and increasing as N gets larger.

What is the easiest way to speed up my P procedure ?
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