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MathGroup Archive 2000

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Re: Newbie question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25335] Re: [mg25275] Newbie question
  • From: David Chapman <d.a.chapman at open.ac.uk>
  • Date: Sat, 23 Sep 2000 03:35:58 -0400 (EDT)
  • Organization: The Open University
  • References: <8q78ca$t81@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Several people have suggested this approach, but note what happens if
you have two data points:

In[1]:=
data = {{a, b}, {c, d}};

In[2]:=
data /. {x_, y_} -> {x, 1/y}

Out[2]=
{{a, b}, {1\c, 1\d}}

I guess this is something you always have to watch for with the 'pattern
matching' approach.

David

Hugh Walker wrote:
> 
> >Hi Mathgroup,
> >
> >I have some numerical data: data:={{x,y},{x1,y1},{x2,y2}....{xn,yn}},
> >I want to transform the data like this:
> >data1:={{x,1/y},{x1,1/y1},{x2,1/y2}....{xn,1/yn}}, how can I do this
> >transformation? Thanx in advance. Regards
> >
> >Jose M Lasso
> ========
> Hi Jose. This will do it
> 
> data = {{a, b}, {c, d}, {e, f}}
> data /. {x_, y_} -> {x, 1/y}
> 
> Have fun!
> 
>     ==
> 
> Hugh Walker
> Gnarly Oaks


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