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 Leicester UK http://www.haystack.demon.co.uk hay at haystack.demon.co.uk voice: +44 (0)116 271 4198 fax: +44(0)116 271 8642