Re: Why are the functions different?
- To: mathgroup at smc.vnet.net
- Subject: [mg55660] Re: [mg55609] Why are the functions different?
- From: "Matthias Bode" <lvsaba at hotmail.com>
- Date: Fri, 1 Apr 2005 05:36:56 -0500 (EST)
- References: <200503310624.BAA15126@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hello Helge:
f1 can be plotted:
f1[x_] = Normal[Series[Tanh[x], {x, 0, 5}]]
Plot[f1[r], {r, 1, 2}]
"=" instead of ":="
Best regards,
MATTHIAS BODE
Torres Sofer III, depto. 9 A
Pedro Borda #1072
esq. Ismael Vásquez
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----- Original Message -----
From: "Helge Stenstroem" <helge.stenstrom.NOSPAM at NOSPAMericsson.com>
To: mathgroup at smc.vnet.net
Subject: [mg55660] [mg55609] Why are the functions different?
> 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
>
>