[R] How to separate a function by 2 probabilities

[Bert Gunter]

Assuming storage is not a problem, first generate two matrices, one by each
method, call these A and B. Then if dim(A) = dim(B) = c(m,n) and k = m*n

z <- rbinom(k,1, .7)

result <- A*z + B*(1-z)


Bert Gunter
Genentech Nonclinical Biostatistics

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Marcio Resende
Sent: Thursday, September 17, 2009 8:11 AM
To: r-help at r-project.org
Subject: [R] How to separate a function by 2 probabilities


Good Mourning,
I have a function to generate a matrix as I show part of it;

g[j,i]<-if (gen[j,i]==0) al1[i,1]+al1[i,1] else ...

However i would like that this function occurred with a probability P and
that another function (another formula to generate g matrix) with
probability P-1

That´s it, if P is .7, i would like that in 70% of the times (for random i
and j) the matrix g was generated according to the formula above and in 30%
of the times with a different formula which i did not write

could anyone help me?
Thank you very much
Márcio

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