is.constant {cwhmisc} | R Documentation |
A numerical vector consists only of identical values
is.constant(x)
x |
a vector |
TRUE if x is numerical and $\max(x) = \min(x)$.
Kjetil Brinchmann Halvorsen, kjetil@acelerate.com, expanded by
Christian W. Hoffmann <christian.hoffmann@wsl.ch>
http://www.wsl.ch/personal_homepages/hoffmann/index_EN
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