- To: mathgroup at yoda.ncsa.uiuc.edu
- Subject: Coefficient
- From: cfcgf at ux1.cts.eiu.edu (Chuck Fleming)
- Date: Sun, 9 Dec 90 10:43:06 CST
> I seem to be having a problem with the behaviour of Coefficient in
> Mathematica, namely if I have a series such as
> sum = ... + a n + b + c/n +....
> then Coefficient[sum,n] gives a, Coefficient[sum,1/n] gives c, but
> Coefficient[sum,1] does NOT give b, but zero instead! This is causing me
> problems, and I cannot see a simple work-around.
You might break up sum into two sums. One with nonnegative powers of n and
one with negative powers of n. Then Coefficient[posSum, n, i] will give the
coefficient of n^i including i=0.
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D and sinh'; s/c vs. s*c^(-1).
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