Re: Generating a function from a series
- To: mathgroup at smc.vnet.net
- Subject: [mg65385] Re: Generating a function from a series
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Wed, 29 Mar 2006 06:34:30 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
On 3/28/06 at 4:05 AM, spam at spam.invalid (Geico Caveman) wrote:
>How does one generate a function from a series ?
>For example :
>sf=Series[f(x),{x,0,3}]; fs[y_]=sf/.x->y
>Now this leaves that pesky O(()^4) term in the function definition,
>rendering the function useless for plots etc. How do I get rid of
>it ?
Use Normal, i.e.,
In[1]:=
sf = Series[f*x, {x, 0, 3}];
fs[y_] = sf /. x -> y
Out[2]=
SeriesData[y, 0, {f}, 1, 4, 1]
In[3]:=
Normal[%]
Out[3]=
f*y
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