Re: Binary Vector Manipulation

*To*: mathgroup at smc.vnet.net*Subject*: [mg84123] Re: Binary Vector Manipulation*From*: dh <dh at metrohm.ch>*Date*: Mon, 10 Dec 2007 20:45:18 -0500 (EST)*References*: <fjj183$frv$1@smc.vnet.net>

Hi Tara, if I understand right, you want a "numerical" Or: numOr[x1_,x2_]:=If[x1==1||x2==1,1,0];SetAttributes[numOr,Listable]; b=numOr[a,b] Now we will zero a random position in b until we have a ratio of 50/50: n=Length[b]; While[0.5<(Plus@@b)/n, b[[RandomInteger[{1,n}]]]=0] hope this helps, Daniel Tara.Ann.Lorenz at gmail.com 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 > > >