Generating binary matrix with fixed number of 1's

Question

How can I generate a binary matrix that has the following behavior? I have came across this solution but it lacks the random positioning of the binary values.

## all rows contain four 1's at random column

       [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]    1    1    1    0    0    0    0    0    1     0
 [2,]    0    0    0    1    1    1    0    0    0     1
 [3,]    0    0    0    1    1    0    0    1    1     0
 [4,]    0    1    1    0    0    0    1    0    0     1
 [5,]    0    1    0    1    0    1    0    1    0     0

What about if I want to randomly assign different numbers of `1's` within a range of `2:4` to each row? e.g, `row1` has two `1s`, `row2` has four `1s` and so on... — jacky_learns_to_code, Feb 05 '17 at 09:51

score 1 · Accepted Answer · answered Feb 01 '17 at 04:29

1

This might not be optimized but will get you going:

m<-matrix(data = rep(sample(rep(c(1,0),times=c(4,6))),times=5),byrow = T,nrow = 5,ncol = 10)
m<-apply(X = m,FUN = sample,MARGIN = 1)
m<-t(m)

answered Feb 01 '17 at 04:29

tushaR

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Generating binary matrix with fixed number of 1's

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