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MathGroup Archive 2003

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Re: proper way to manipulate lists?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40192] Re: [mg40182] proper way to manipulate lists?
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Tue, 25 Mar 2003 14:47:51 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Nathan,

data2=data . DiagonalMatrix[{a,b}]

Adriano Pascoletti

Marted=EC, 25 Mar 2003, alle 09:04 Europe/Rome, Nathan Moore ha scritto:

>
> 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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