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MathGroup Archive 2003

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Re: proper way to manipulate lists?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40207] Re: [mg40182] proper way to manipulate lists?
  • From: Tomas Garza <tgarza01 at prodigy.net.mx>
  • Date: Tue, 25 Mar 2003 14:51:11 -0500 (EST)
  • References: <200303250804.DAA08362@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Look in the Help Browser for Inner. Example:

In[1]:=
data = {{x, u}, {y, v}, {z, w}};

In[2]:=
Inner[Times, data, {a, b}, List]
Out[2]=
{{a*x, b*u}, {a*y, b*v}, {a*z, b*w}}

Tomas Garza
Mexico City
----- Original Message -----
From: "Nathan Moore" <nmoore at physics.umn.edu>
To: mathgroup at smc.vnet.net
Subject: [mg40207] [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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