nrow: The Number of Rows/Columns of an Array

Description Usage Arguments Value References See Also Examples

Description

nrow and ncol return the number of rows or columns present in x. NCOL and NROW do the same treating a vector as 1-column matrix.

Usage

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nrow(x)
ncol(x)
NCOL(x)
NROW(x)

Arguments

x

a vector, array or data frame

Value

an integer of length 1 or NULL.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole (ncol and nrow.)

See Also

dim which returns all dimensions; array, matrix.

Examples

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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