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Re: Problem with coeff

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From	Joe Riel <joer@san.rr.com>
Newsgroups	comp.soft-sys.math.maple
Subject	Re: Problem with coeff
Date	Mon, 05 Jan 2015 13:27:56 -0800
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peter.luschny@gmail.com writes:

> p := x -> 7/(-1+x)^0 +6/(-1+x)^1 +1/(-1+x)^2;
> seq(coeff(p(x),(-1+x),-k),k=0..2);
>
> gives me what I want: 7,6,1.
> I expected to get the same result with
>
> r := x -> 2*subs(x=(x/(1-x)),orthopoly[L](2,x));
> convert(r(x),parfrac); 
> seq(coeff(%,(-1+x)^(-j)),j=0..2);
>
> But I get an error: 'invalid input'. 
> A bug? Workaround?

Use the three argument form of coeff, as you did in the original:

seq(coeff(%,(-1+x),-j),j=0..2);
                           7,6,1



-- 
Joe Riel

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Problem with coeff peter.luschny@gmail.com - 2015-01-05 13:08 -0800
  Re: Problem with coeff Joe Riel <joer@san.rr.com> - 2015-01-05 13:27 -0800
    Re: Problem with coeff peter.luschny@gmail.com - 2015-01-05 13:34 -0800

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