MathGroup Archive 1999

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problem with Part function

  • To: mathgroup at
  • Subject: [mg18172] problem with Part function
  • From: "Casubolo Dario" <bubbola at>
  • Date: Sat, 19 Jun 1999 23:54:31 -0400
  • Sender: owner-wri-mathgroup at

Just a little problem:
I've a matrix of zeros, say:
then, I've a point in xy axys,
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.

Dario Casubolo
email: bubbola at

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