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MathGroup Archive 1993

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Re: Lists

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Lists
  • From: jeff at apl.washington.edu (jeff schindall)
  • Date: Wed, 17 Mar 1993 08:55:53 -0500

>Richard writes:
>-----------------------------------
>I am having a difficult time dealing with lists.
>I have a list of data :
>
>{{1,2},{2,3},{4,5}}
>
>I want to do some operations on the second column only.
>Such as +1, Sin[], etc to each element in the second
>column.  I admit I only have a rudimentary knowledge
>of Map, Apply, Transpose, and Flatten.  Any help would 
>be appreciated.
>
>Also, I have data that needs several fitting equations.
>One will be Exp[a x -b], another Exp[-c x+d], and the
>last would be a polynomial.  Then I would like to Plot
>the data and fitting equations in there respective 
>regions at the same time.  I have seen something
>like this before, but I can't remember where.
>
>Thanks
>
Try

        a = {{1,2},{2,3},{4,5}}
        f[{x_,y_}]:= {x,Sin[y]}

        g=Thread[f[a]]
 



        	       	       	-jeff







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