Re: beginner's question -- syntax related?
- To: mathgroup at smc.vnet.net
- Subject: [mg13329] Re: beginner's question -- syntax related?
- From: Arnoud Buzing <arnoudb>
- Date: Mon, 20 Jul 1998 02:49:51 -0400
- Organization: Wolfram Research, Inc.
- References: <6okkt8$1m0@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
John M. Dlugosz wrote:
>
> This works: Plot[{3-Sqrt[5-4x-x^2],3+Sqrt[5-4x-x^2]}, {x, -5, 0}]
>
> This doesn't:
> ls := {3-Sqrt[5-4x-x^2],3+Sqrt[5-4x-x^2]}, {x, -5, 0}
>
> Plot[ls, {x,-5,0}]
>
> Somehow, the ls isn't getting taken as the list of two expressions. I
> tried both = and := when creating ls, with the identical effect.
>
> Clearly, I'm missing something about syntax. Can someone help me?
>
> --John
This may help:
Plot[Evaluate[ls], {x, -5, 0}]
Plot is one of a few, but important functions that do not follow the
standard evaluation procedure. See 2.5.5 of the Mathematica book for an
explanation.