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 ==== [MESSAGE SEPARATOR] ====