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MathGroup Archive 2006

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Re: Creating a new table using values from a column in another table,

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66371] Re: Creating a new table using values from a column in another table,
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Thu, 11 May 2006 02:14:27 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <e3sgqp$lsf$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Wonko the Sane wrote:
> Hi all,
> 
> I have a question that I have not been able to work out myself, and so 
> put it to the group to help. I have a set of data points in a table (2 
> columns {{x1,y1},{x2,y2},....,{xn,yn}}) I have performed a fit to the 
> data and have a function f[x] which I would now like to evaluate at each 
> data point (column 1 of the first table) to get a new table 
> {{x1,f[x1]},{x2,f[x2]},....,{xn,f[xn]}}. Is there a way to do this? I 
> hope my request is clear
> 
> Best Regards
> Michael
> 
Hi Michael,

This (In[4]) should do what you want:

In[1]:=
data = Table[{n, Random[] + Sin[n]}, {n, 0, 4*Pi, 4*(Pi/100.)}];

In[2]:=
ListPlot[data, PlotStyle -> PointSize[0.02]];

In[3]:=
func[x_] = Fit[data, {1, Sin[x]}, x]

Out[3]=
0.40600651483282013 + 1.0079803137250567*Sin[x]

In[4]:=
({#1, func[#1]} & ) /@ data[[All,1]];

In[5]:=
ListPlot[%, PlotStyle -> PointSize[0.02]];

Best regards,
Jean-Marc


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