Re: How to select terms wanted in a series

*To*: mathgroup at smc.vnet.net*Subject*: [mg85950] Re: How to select terms wanted in a series*From*: Bill Rowe <readnewsciv at sbcglobal.net>*Date*: Thu, 28 Feb 2008 02:55:47 -0500 (EST)

On 2/27/08 at 4:33 AM, GRseminar at gmail.com (Barrow) wrote: >I have an expression, which is a sum of large number of terms, e.g. >expression = x + 2x*y - x*y*z + u*x*y + 3u^2 >And I want to select out terms with the factor (x*y). e.g. >The terms in "expression" that I want are 2x*y, -x*y*z, u*x*y Try using Coefficient, i.e. In[5]:= Coefficient[x + 2 x*y - x*y*z + u*x*y + 3 u^2, x y] Out[5]= u-z+2 or if you want a list List@@Coefficient[[x + 2 x*y - x*y*z + u*x*y + 3 u^2, x y] -- To reply via email subtract one hundred and four