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
>
>