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

*To*: mathgroup at smc.vnet.net*Subject*: [mg66403] Re: [mg66346] Creating a new table using values from a column in another table,*From*: János <janos.lobb at yale.edu>*Date*: Thu, 11 May 2006 02:16:28 -0400 (EDT)*References*: <200605101034.GAA21842@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On May 10, 2006, at 6:34 AM, 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 Here is a newbie approach: In[1]:= lst = Table[{ToExpression[ StringJoin["x", ToString[i]]], ToExpression[StringJoin[ "y", ToString[i]]]}, {i, 5}] Out[1]= {{x1, y1}, {x2, y2}, {x3, y3}, {x4, y4}, {x5, y5}} In[3]:= ({#1[[1]], f[#1[[1]]]} & ) /@ lst Out[3]= {{x1, f[x1]}, {x2, f[x2]}, {x3, f[x3]}, {x4, f[x4]}, {x5, f[x5]}} János --------------------------------------------------------- What is the difference between OS X and Vista ? Microsoft employees are exited about OS X. http://daringfireball.net/2006/04/windows_the_new_classic

**References**:**Creating a new table using values from a column in another table,***From:*Wonko the Sane <noone@nowhere.com>