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Re: Coefficient problem

• To: mathgroup at smc.vnet.net
• Subject: [mg36433] Re: Coefficient problem
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Sat, 7 Sep 2002 02:53:39 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <al9l5k$b1h$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

and

Delta[eq_, x_]:=Coefficient[eq, x]^2 - 4 Coefficient[eq, x,2]
Coefficient[eq, x,0]

does what you want. Because the Help-Browser say:

"Coefficient[expr, form, 0] picks out terms that are not proportional to
form."

Regards
  Jens

CeZaR wrote:
> 
> Hi,
> 
> Now I'm trying to calculate this formula:
> 
> Delta[eq_, x_]:=Coefficient[eq, x]^2 - 4 Coefficient[eq, x^2] Coefficient[eq, x^0]
> 
> eq has this form a x^2 + b x + c
> 
> But there is a problem with the x^0 coefficient!
> How can I overcome that?
> 
> Thanks!
> 
> CeZaR