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Re: Binary Vector Manipulation

  • To: mathgroup at
  • Subject: [mg84123] Re: Binary Vector Manipulation
  • From: dh <dh at>
  • Date: Mon, 10 Dec 2007 20:45:18 -0500 (EST)
  • References: <fjj183$frv$>

Hi Tara,

if I understand right, you want a "numerical" Or:



Now we will zero a random position in b until we have a ratio of 50/50:


While[0.5<(Plus@@b)/n, b[[RandomInteger[{1,n}]]]=0]

hope this helps, Daniel

Tara.Ann.Lorenz at wrote:

> I am need of assistance programming the following scenario:


> I have two vectors composed of 0's and 1's.  Vector "A" has 5% 1's

> (and 95% 0's) while Vector "B" has 50% 1's and 50% 0's.


> First, I would like to change Vector B to have a "1" in every place

> that Vector A also has a "1" (in other words, I will then have more

> than 50% 1's in Vector B once this step is completed).


> Then, I would like to *randomly* return Vector B back to a 50/50

> distribution of 1's and 0's.


> I greatly appreciate any proposed programming methods.


> Thank you,

> Tara




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