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MathGroup Archive 2003

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Re: proper way to manipulate lists?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40205] Re: [mg40182] proper way to manipulate lists?
  • From: Ken Levasseur <klevasseur at mac.com>
  • Date: Tue, 25 Mar 2003 14:50:48 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Nathan:

Here is one way to do it:

#{a, b} & /@ data

Ken Levasseur
Math. Sci. 
UMass Lowell

> From: Nathan Moore <nmoore at physics.umn.edu>
To: mathgroup at smc.vnet.net
> Date: Tue, 25 Mar 2003 03:04:24 -0500 (EST)
> To: mathgroup at smc.vnet.net
> Subject: [mg40205] [mg40182] proper way to manipulate lists?
> 
> 
> I'm sure this is a one-liner, but it has stumped me for years.  Suppose
> I'm working with a 2-d array of data,
> data = {{x1,y1},{x2,y2}...{xN,yN}};
> and I want to transform the data according to,
> data2 = {{x1*a,y1*b},{x2*a,y2*b}...{xN*a,yN*b}};
> The only way I know to do this is to move the data to excel,
> performing the transform and then move the data back to Mathematica.  This
> is crazy - there must be a better way - is there?  Please tell me there
> is!
> 
> regards,
> 
> Nathan Moore, University of Minnesota Physics Department
> 
> 



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