Re: Maclaurin Series

• To: mathgroup at smc.vnet.net
• Subject: [mg48156] Re: Maclaurin Series
• From: "Carlo Teubner" <.Teubner at t-online.de (FirstLetterOfMyFirstName)>
• Date: Fri, 14 May 2004 20:59:14 -0400 (EDT)
• Organization: Oxford University, England
• References: <c81h52\$4qb\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

try

f1t[x_] = Normal[Series[f1[x], {x, 0, 10}]].

You need to do this since Series[] gives you a SeriesData object which needs
to be converted to a normal expression.

Carlo

"Xiaolei Li" <xli10 at uiuc.edu> schrieb im Newsbeitrag
news:c81h52\$4qb\$1 at smc.vnet.net...
> hi,
>
> i have some function defined in f1.  i'd like to define a new function,
> f1t, that is the Maclaurin expansion of f1.  when i do something like:
>
> Series[f1[x], {x, 0, 10}]
>
> it gives me the correct expansion.  but how do i define f1t?  i tried:
>
> f1t[x_] := Series[f1[x], {x, 0, 10}]
>
> that doesn't work because it evaluates f1[x] before giving it to
> Series[].  i also tried something like:
>
> f1t[x_] := Evaluate[ Series[f1[x], {x, 0, 10}] ]
>
> but that didn't work either.  i'm a mathematica n00b.  any help is
> greatly appreciated.  thx.
>
> --
> Xiaolei Li        |       xli10 at uiuc.edu       |        www.xiaolei.org
>

```

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