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.