Why are the functions different?
- To: mathgroup at smc.vnet.net
- Subject: [mg55609] Why are the functions different?
- From: Helge Stenstroem <helge.stenstrom.NOSPAM at NOSPAMericsson.com>
- Date: Thu, 31 Mar 2005 01:24:00 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
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