How to generate a binary matrix with random number of 1s within a specific range, say between two to five, and at random positions?
I have tried matrix(sample(0:1, 10, replace = T), 5, 10), but I have no control of the number of 1s being generated.
Expected random output:
## each row has number of 1s in range(2,5)
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 1 1 1 0 0 0 0 0 1 0 ## four 1s at row 1
[2,] 0 0 0 1 1 0 0 0 0 1 ## three 1s at row 2
[3,] 0 0 0 0 1 0 0 1 0 0 ## two 1s at row 3
[4,] 1 1 1 0 0 0 1 0 0 1 ## five 1s at row 4
[5,] 0 1 0 1 0 1 0 1 0 0 ## four 1s at row 5
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