[Date Index]
[Thread Index]
[Author Index]
Re: Extracting terms from an equation
*To*: mathgroup at smc.vnet.net
*Subject*: [mg69786] Re: Extracting terms from an equation
*From*: dimmechan at yahoo.com
*Date*: Sat, 23 Sep 2006 04:44:13 -0400 (EDT)
*References*: <eevubf$hqu$1@smc.vnet.net>
Can someone explain the difference in the following?
Cases[a + b*x^2 + c*y^2 + d*x*y + e*x^3, _?( !FreeQ[#1, x] & )]
{b*x^2, e*x^3, d*x*y}
Cases[a + b*x^2 + c*y^2 + d*x*y + e*x^3, _?(MemberQ[#1, x] & )]
{d*x*y}
Thanks
Î?/Î? Coleman, Mark ÎÎ³Ï?Î±Ï?Îµ:
> Greetings,
>
> I'd like to find a general way to extract all of the terms from an
> equation that involve a given variable. For instance, consider the
> equation
>
> myEquation == Exp[a + b x^2 + c y^2 + d x y + e x^3]]
>
> I'd like to define a function such that
>
> myFunction[myEquation,x] returns the result {b x^2, d x y, e x^3}
>
> Thanks,
>
> -Mark
Prev by Date:
**notebook interface: how make the cursor to be a 'block' cursor instead of the default?**
Next by Date:
**Re: Suggestions for translating a Do[] loop ...**
Previous by thread:
**Re: Extracting terms from an equation**
Next by thread:
**Re: Re: Extracting terms from an equation**
| |