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Extract information on the NA action used to create an object.
na.action(object, …)any object whose NA action is given.
further arguments special methods could require.
Information from the action which was applied to object if
NAs were handled specially, or NULL.
na.action is a generic function, and na.action.default its
default method. The latter extracts the "na.action" component
of a list if present, otherwise the "na.action" attribute.
When model.frame is called, it records any information
on NA handling in a "na.action" attribute. Most
model-fitting functions return this as a component of their result.
Chambers, J. M. and Hastie, T. J. (1992) Statistical Models in S. Wadsworth & Brooks/Cole.
options("na.action"), na.omit,
na.fail, also for na.exclude, na.pass.
# NOT RUN {
na.action(na.omit(c(1, NA)))
# }
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