Re: I need some help about this error

*To*: mathgroup at smc.vnet.net*Subject*: [mg39314] Re: [mg39305] I need some help about this error*From*: "milkcart" <milkcart at m17.alpha-net.ne.jp>*Date*: Tue, 11 Feb 2003 04:41:12 -0500 (EST)*References*: <200302100608.BAA23852@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Plot have property of HoldAll In[58]:= Attributes[Plot] Out[58]= {HoldAll, Protected} So if you plot t={2x+1,-2x+3} with the next sentence, t={2x+1,2x-3}; Plot[t,{1,2}] error is returned. Plot uses to number 1 to evaluate "t". But t is not a list of function, but only a letter. This happens because of the Plot's property of HoldAll. Mathematica regard t as a letter "t", not a list of functions {2x+1,2x-3} You can have mathematica know "t" as a list of function, by using Evaluate in a Plot command. t={2x+1,2x-3}; Plot[Evaluate[t], {x,1,2}] Help of Plot and A4.2 might be useful to you. ************ milkcart milkcart at m17.alpha-net.ne.jp

**References**:**I need some help about this error***From:*spin9@terra.com.br (baruch)