Re: How to isolate the constant in a two variable equation?
- To: mathgroup at smc.vnet.net
- Subject: [mg113484] Re: How to isolate the constant in a two variable equation?
- From: "Eduardo M. A. M.Mendes" <emammendes at gmail.com>
- Date: Sat, 30 Oct 2010 04:39:28 -0400 (EDT)
Hello Many many thanks. It worked fine but I had to use Expand before issuing the command. Cheers Ed From: Thomas Dowling [mailto:thomasgdowling at gmail.com] Sent: Friday, October 29, 2010 9:06 AM To: Eduardo M. A. M.Mendes Subject: [mg113484] Re: How to isolate the constant in a two variable equation? Hello, expr = 4 X*X + 3 Y*Y + 2 X*Y + 1 Select[expr, FreeQ[#, _Symbol] &] or Select[expr, FreeQ[#, X | Y] &] is the way I would do it. Tom Dowling On Fri, Oct 29, 2010 at 11:30 AM, Eduardo M. A. M.Mendes <emammendes at gmail.com> wrote: Hello I know that Coefficient can isolate the coefficient relate to the variables in an equation but I wonder how the constant could be retrieved. Something like 4X*X+3Y*Y+2X*Y+1 How to get to isolate the constant 1? Many thanks Ed