is.constant {cwhmisc}R Documentation

is.constant

Description

A numerical vector consists only of identical values

Usage

is.constant(x)

Arguments

x a vector

Value

TRUE if x is numerical and $\max(x) = \min(x)$.

Author(s)

Kjetil Brinchmann Halvorsen, kjetil@acelerate.com, expanded by Christian W. Hoffmann <christian.hoffmann@wsl.ch>
http://www.wsl.ch/personal_homepages/hoffmann/index_EN

See Also

identical, all.equal

Examples

 is.constant(rep(c(sin(pi/2),1),10)) # TRUE
 x <- factor(c(1,1,NA))
 is.constant(x)            # FALSE because of NA
 is.constant(x[1:2])       # TRUE
 is.constant(c(1,1,NA))    # FALSE because of NA
 is.constant(c(1,1,2))     # FALSE
 is.constant(c(1,1,1))     # TRUE

[Package cwhmisc version 2.0.1 Index]