[R] Discarding a matrix based on the rowSums value

[Juan Antonio Balbuena]

Hello
I would appreciate your help on the followig. I want to generate random
binary matrices but I need to discard those with all-1 rows. That is, for a
10x10 matrix with five 1's

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

would be passed on to further computations, whereas

      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]    0    0    0    0    0    0    0    0    0    0
 [2,]    0    0    0    0    0    0    0    0    0     0
 [3,]    0    0    0    0    0    0    0    0    0     0
 [4,]    0    0    0    0    0    0    0    0    0     0
 [5,]    0    0    0    0    0    0    0    0    0     0
 [6,]    0    0    0    0    0    0    0    0    0     0
 [7,]    0    0    0    0    0    0    0    0    0     0
 [8,]    0    0    0    0    0    0    0    0    0     0
 [9,]    0    0    0    0    0    0    0    0    0     0
[10,]    0    1    0    1    0    1    1    0    0     1
must be discarded.

For any N.1s <= Nrow, I am trying

Nrow = 10
Ncol = 10 
N.1s = 5
flag <- TRUE
while (flag == TRUE) { 
m <- matrix ((sample (c(rep(1, each=N.1s), rep(0,
each=((Ncol*Nrow)-N.1s))))), Nrow)
SUMROW <- rowSums(m)
	if (SUMROW == N.1s) {flag <- TRUE} else {flag <- FALSE}
	}
}

but I get this warning
Warning message:
In if (SUMROW == N.1s) { :
  the condition has length > 1 and only the first element will be used

What I specifically need is a way to write "If any of the elements of the
SUMROW vector == N.1s then flag <-true else flag<-false".

Any help would be much appreciated.

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