       Re: Extracting all the variables from a list of equations?

• To: mathgroup at smc.vnet.net
• Subject: [mg25507] Re: [mg25482] Extracting all the variables from a list of equations?
• From: Tomas Garza <tgarza01 at prodigy.net.mx>
• Date: Thu, 5 Oct 2000 23:50:25 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```In:=
Cases[v, x_ /; Head[x] == Symbol, {2}] // Union
Out=
{v\$233Period, v\$234Period, v\$235Period, v\$236Period}

Tomas Garza
Mexico City

"Ryan VanRiper (--)" <ravanrip at yahoo.com> wrote:

> How would i go about extracting all the variables from a list of
> inequalities?
>
> If i had..   V = {v\$233Period > 0,  v\$234Period == v\$233Period,
> v\$236Period <= v\$235Period}
>
> I would like to get a list that looks like the following..
>
> X = {v\$233Period, v\$234Period, v\$233Period, v\$236Period,
v\$235Period}
>
> Then find all the unique elements to give an answer..
>
> Y = {v\$233Period, v\$234Period, v\$236Period, v\$235Period}

```

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