Re: Coefficient in multivariate series

• To: mathgroup at smc.vnet.net
• Subject: [mg3576] Re: Coefficient in multivariate series
• From: Harald Berndt <haraldb at nature.berkeley.edu>
• Date: Mon, 25 Mar 1996 21:35:35 -0500
• Organization: University of California Forest Prodcts Lab
• Sender: owner-wri-mathgroup at wolfram.com

Samuel Bengmark wrote:
>
> I wonder if anyone out there knows how to get mathematica
> to extract a coefficient of a monomial in a multivariate to
> series or polynomial. For example how do I get mathematica to
> give me the coefficient of x*y*z^3 in (1+x+y)^2*(2+y)*(5+z)^4.

It's not very elegant, but I could'n get any simpler forms to work ...
This will do it for you:

First[
Select[t,
(MemberQ[#, x] && MemberQ[#, y] && MemberQ[#, Power[z, 3]])& ]
]

Best,

--
______________________________________________________________________
Harald Berndt,                                University of California
Research Specialist                         Forest Products Laboratory

Phone:	510-215-4224                                FAX:			510-215-4299

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