Re: Matrix question

*To*: mathgroup at smc.vnet.net*Subject*: [mg60311] Re: Matrix question*From*: Bill Rowe <readnewsciv at earthlink.net>*Date*: Sat, 10 Sep 2005 22:36:33 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

On 9/10/05 at 6:46 AM, sandog at mail.gr (sandog) wrote: >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 . One way to do this would be as follows mat = SparseArray@Table[ {Random[Integer,n],Random[Integer,n}->1,{Floor[p n^2]}] where n is the size of the matrix you want and p is the percentage of ones you want. Note if p is large, there may be more efficient ways to achieve what you want than using SparseArray. -- To reply via email subtract one hundred and four