Re: On Reduce
- To: mathgroup at smc.vnet.net
- Subject: [mg72043] Re: On Reduce
- From: "sigmundv" <sigmund at ostenfeld.dk>
- Date: Sat, 9 Dec 2006 06:09:52 -0500 (EST)
- References: <elbi51$k23$1@smc.vnet.net>
Hi mr. V. Stokes,
You can use First[] and Last[], respectively, to assign 0 and 8,
respectively, to a variable.
//Sigmund
Virgil Stokes wrote:
> I have the following small piece of Mathematica code that works fine for
> my purposes.
>
> BInv = {{ 1/4, 1/4, 0},
> {-1/2, 1/2, 0},
> { 3/4, -5/4, 1}}
> B = Inverse[BInv]
> b = {4 + \[Delta], 8, 10};
> BInv.b // FullSimplify
> Reduce[{%[[1]] >= 0, %[[2]] >= 0, %[[3]] >= 0}, {\[Delta]}]
> % /. {\[Delta] -> b1 - 4} // FullSimplify
>
> which gives
>
> 0 <= b1 <= 8
>
> which is of course correct. But, how can I use (access) the values 0 and 8?
> That is, I would like to now use these values in some expressions that
> would follow this.
>
> Thanks,
> V. Stokes