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MathGroup Archive 1999

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Re: problem with Part function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18196] Re: [mg18172] problem with Part function
  • From: "David Park" <djmp at earthlink.net>
  • Date: Mon, 21 Jun 1999 22:50:38 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

>
>Just a little problem:
>I've a matrix of zeros, say:
>mat=Table[Table[0,{5}],{5}];
>then, I've a point in xy axys,
>xy={3,3};
>now, I want the position {3,3} of matrix becomes 1;
>if I write
>mat[[xy]]=1; or mat[[{3,3}]]=1; it doesn't work; only mat[[3,3]]=1 
>works, but I don't want rewrite all.
>I think I've to use something like Map, Thread, Apply or so, but I don't 
>know what and how exactely;
>please, someone help me.
>THANK YOU
>
>Dario Casubolo
>email: bubbola at workline.it
>


Dario,

Apply Sequence to the list to turn it into arguments for mat part.

mat[[Sequence@@{3,3}]]

works.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/





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