nr {SciViews}

Convenience functions for rows or columns manipulations.

Description

nr() and nc() are synonyms of the ugly NROW() or NCOL() that still provide a result, even if dim attribute of the object is not set, on the contrary to nrow()or ncol(). ROWS and COLS are constants that makes call to apply() more expressive.

Usage

nr(x)

nc(x)

ROWS

COLS

Arguments

x

Any object.

Format

An object of class numeric of length 1.

See Also

NROW()

Examples

mm <- matrix(1:6, nrow = 3)
nr(mm)
nc(mm)
vv <- 1:6
nr(vv)
nc(vv)
# ROWS and COLS constants used with apply()
apply(mm, ROWS, mean) # Idem apply(mm, 1, mean)
apply(mm, COLS, mean) # Idem apply(mm, 2, mean)