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MathGroup Archive 2003

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Re: proper way to manipulate lists?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40195] Re: proper way to manipulate lists?
  • From: Peter W <pewei at algonet.se>
  • Date: Tue, 25 Mar 2003 14:48:25 -0500 (EST)
  • References: <b5p158$7sk$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

better than my first try maybe?

data = {{x1, y1}, {x2, y2}, {x3, y3}, {x4, y4}, {x5, y5}}

data /. {p_, q_} -> {a p, b q}
gives:
{{a x1, b y1}, {a x2, b y2}, {a x3, b y3}, {a x4, b y4}, {a x5, b y5}}

Best regards
Peter W

Nathan Moore wrote:

> 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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