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Re: Using Coefficient on an equation


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



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