Re: coefficients but not from polynomial (variables does not work)
- To: mathgroup at smc.vnet.net
- Subject: [mg97979] Re: coefficients but not from polynomial (variables does not work)
- From: dh <dh at metrohm.com>
- Date: Fri, 27 Mar 2009 05:33:51 -0500 (EST)
- References: <gqfm9a$lfv$1@smc.vnet.net>
Hi Magdalena,
you may e.g. use Cases on the lowest level to pick out symbols. Union
ensures that each variable appears only once:
Union@Cases[Sin[x] + Sin[y], _Symbol, {-1}]
hope this helps, Daniel
magdamoczydlowska at gmail.com wrote:
> Dear All,
>
> Probably my question is very simple. Suppose that we have expression
> a= Sin[x]+Sin[y]. I would like receive variables from which this
> expression is dependent, so in this case {x,y}. The Variables does not
> work of course in this because it is not a polynomial and it gives me
> {Sin[x],Sin[y]}. Do anyone know how to solve my problem.
>
> I would be very grateful for quick response.
>
> Magdalena
>