R: Is an Object Atomic?

This help topic is for R version 0.60. For the current version of R, try https://stat.ethz.ch/R-manual/R-patched/library/base/html/is.atomic.html

is.atomic {base}

R Documentation

Is an Object Atomic?

is.atomic returns TRUE if x does not have a list structure and FALSE otherwise.

is.atomic(x)