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MathGroup Archive 2005

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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
COCHABAMBA/BOLIVIA

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LVSABA at HOTMAIL.COM
Time indicated: UTC (=GMT).



----- 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
>
> 


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