Re: Why are the functions different?

*To*: mathgroup at smc.vnet.net*Subject*: [mg55648] Re: Why are the functions different?*From*: yehuda ben-shimol <bsyehuda at gmail.com>*Date*: Fri, 1 Apr 2005 05:36:20 -0500 (EST)*References*: <200503310624.BAA15126@smc.vnet.net>*Reply-to*: yehuda ben-shimol <bsyehuda at gmail.com>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, I believe this was already discuss on Mathgroup. You need to "Evaluate" f1[x] as the following Plot[Evaluate[f1[x]], {x, 0, 12}] The attributes of the Plot[] function are (note that Attributes[Plot] are {HoldAll, Protected} ) yehuda On Thu, 31 Mar 2005 01:24:00 -0500 (EST), Helge Stenstroem <helge.stenstrom.NOSPAM at nospamericsson.com> wrote: > How are these two functions (f0 and f1) different? f0 can be plotted, > but f1 cannot. > > f1[x_] := Normal[Series[Tanh[x], {x, 0, 5}]] > f0[x_] := x - x^3/3 + (2*x^5)/15 > > When evaluated like this: > f0[x] > f1[x] > they look the same. > > The following gives error messages if f0 is replaced by f1. > Plot[{Tanh[z], f0[z]}, {z, -1, 1}] > > (Mathematica 4.1 on Windows 2000) > -- > Helge Stenström > >