discard rows if at least one cell equals 0

Question

Example data frame:

test <- data.frame(A=c(0,1,2), B=c(0,2,3), C=c(0,1,0))
test
  A B C
1 0 0 0
2 1 2 1
3 2 3 0

What I am trying to get:

  A B C
2 1 2 1

When a row contains ≥1 cell equals to 0, discard it.

I am aware of the following, but I am looking for a more general solution, in the case I don't know how many columns my data frame is made of.

test[which(test$A !=0 & test$B !=0 & test$C != 0),]

Answer 1

We can use rowSums to subset the rows where there are no zeroes.

test[rowSums(test == 0) == 0, ]

#  A B C
#2 1 2 1