row/colnames {base}

R Documentation

Row and Columnn Names

Description

Retrieve or set the row or column names of an object (the first or second component of its dimnames).

Usage

rownames(x, do.NULL = TRUE, prefix = "row")
rownames(x) <- namevector

colnames(x, do.NULL = TRUE, prefix = "col")
colnames(x) <- namevector

Arguments

x
do.NULL	logical. Should this create names if they are NULL?
prefix	for created names.

Details

If do.NULL is FALSE, a character vector (of length NROW(x) or NCOL(x) is returned in any case, prepending prefix to simple numbers, if dimnames(x)[[i]] (i = 1 or 2) is NULL.

See Also

dimnames, case.names, variable.names.

Examples

m0 <- matrix(NA, 4, 0)
m2 <- cbind(1,1:4)
rownames(m0)

colnames(m2, do.NULL = FALSE)
colnames(m2) <- c("x","Y")
rownames(m2) <- rownames(m2, do.NULL = FALSE, prefix = "Obs.")
m2

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