Re: proper way to manipulate lists?

• To: mathgroup at smc.vnet.net
• Subject: [mg40194] Re: proper way to manipulate lists?
• From: Peter W <spamm at spammo.com>
• Date: Tue, 25 Mar 2003 14:48:09 -0500 (EST)
• References: <b5p158\$7sk\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Sure, a oneliner!

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

Map[({a, b}#) &, data]

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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