nrow(x) ncol(x) NCOL(x) NROW(x)
x
| a vector, array or data frame |
nrow and ncol return the number of rows or columns
present in x.
NCOL and NROW do the same, but treat a vector as
1-column matrix.dim which returns all dimensions;
array, matrix.ma <- matrix(1:12, 3, 4) nrow(ma) # 3 ncol(ma) # 4 ncol(array(1:24, dim = 2:4)) # 3, the second dimension NCOL(1:12) # 1 NROW(1:12) # 12