Re: beginner's question -- syntax related?
- To: mathgroup at smc.vnet.net
- Subject: [mg13360] Re: beginner's question -- syntax related?
- From: "Allan Hayes" <hay at haystack.demon.cc.uk>
- Date: Mon, 20 Jul 1998 02:50:13 -0400
- References: <6okkt8$1m0@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
John M. Dlugosz wrote in message <6okkt8$1m0 at smc.vnet.net>...
>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
>
John,
Plot does not know that ls will be a list when evaluated, use
Plot[Evaluate[ls], {x,-5,0}]
-------------------------------------------------------------
Allan Hayes
Training and Consulting
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http://www.haystack.demon.co.uk
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