Test for Numeric Argument

Description

Test whether argument is numeric or a data.frame with numeric columns.

Usage

isNumeric(x)

Arguments

Details

This function is used to check the validity of arguments for numeric functions. It is an attempt to emulate the behavior of internal generic math functions.

isNumeric differs from is.numeric in that data.frames with all columns numeric are accepted as numeric.

Value

TRUE or FALSE

Author(s)

Gordon Smyth

See Also

is.numeric, Math

Examples

isNumeric(3)
isNumeric("a")
x <- data.frame(a=c(1,1),b=c(0,1))
isNumeric(x)   # TRUE
is.numeric(x)  # FALSE