Re: Using Coefficient on an equation
- To: mathgroup at smc.vnet.net
- Subject: [mg95475] Re: [mg95433] Using Coefficient on an equation
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Mon, 19 Jan 2009 03:00:41 -0500 (EST)
- Reply-to: hanlonr at cox.net
f = a*x^2 + b*x + c == 0; Coefficient[f[[1]], x^2] a Bob Hanlon ---- carlos at colorado.edu wrote: ============= If f=a*x^2+b*x+c, Coefficient[f,x^2] obviously returns a. But if f=a*x^2+b*x+c==0, it returns 0. The problem arose using the Calculus`VariationalMethods` package. It (unfortunately) returns the Euler-Lagrange equations as such, so I have to remove the useless ==0 appendage for Coefficient to work properly. Is there a simple direct way out? -- Bob Hanlon