Return a (temporarily) invisible copy of an object.
an arbitrary R object.
This function can be useful when it is desired to have functions return values which can be assigned, but which do not print when they are not assigned.
This is a primitive function.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
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