Re: Why polynomial Can't output as single Number?
- To: mathgroup at smc.vnet.net
- Subject: [mg69017] Re: Why polynomial Can't output as single Number?
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Sat, 26 Aug 2006 04:40:07 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <ecop0n$2ve$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
William wrote:
> data={7,2,3,25,1,10};
> f=InterpolatingPolynomial[data,x];
> f/.x->5;
>
> Result as attachment picture.
>
> why can't get a simply number?
>
> thanks
>
> Please see picture:
> http://lh3.google.com/sunose/RO6YrIfQABI/AAAAAAAAAHM/Mv4mNbq31mI/polynomial.JPG
>
> thanks
>
Works fine here. Try with a fresh kernel without loading any packages to
see what happens.
In[1]:=
data = {7, 2, 3, 25, 1, 10};
f = InterpolatingPolynomial[data, x];
f /. x -> 5
Out[3]=
1
In[4]:=
N[f /. x -> 5]
Out[4]=
1.
In[5]:=
N[f /. x -> 5, 2]
Out[5]=
1.0
In[6]:=
dd = N[f /. x -> 5, 2]
Out[6]=
1.0
In[7]:=
Head[dd]
Out[7]=
Real
In[8]:=
$Version
Out[8]=
5.2 for Microsoft Windows (June 20, 2005)
HTH,
Jean-Marc
