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MathGroup Archive 2005

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Re: Matrix question

  • To: mathgroup at
  • Subject: [mg60299] Re: [mg60287] Matrix question
  • From: "Ingolf Dahl" <ingolf.dahl at>
  • Date: Sat, 10 Sep 2005 22:36:17 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

If n is size of matrix and 100p is the percentage, try

n = 10; p = 0.1; Table[UnitStep[Random[] - (1 - p)], {n}, {n}]

Best regards

Ingolf Dahl

> -----Original Message-----
> From: sandog [mailto:sandog at] 
To: mathgroup at
> Sent: den 10 september 2005 12:47
> Subject: [mg60299] [mg60287] Matrix question
> i want to create a NxN matrix with zeros but i want a 
> percentage of the matrix spots to be one at random spots any 
> idea? cause i have no clue how to do that.
> Any help appreciated thx .

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