clear — Clear variable or function
clear is a function that allows you to clean up the symbol table.
It deletes the variables and functions that you specify in the argument
list. clear accepts up to 32 arguments, and returns the
number of objects that have been successfully cleared. You can not
clear a built-in function. You should beware of clearing the
values of pi and eps, as many R-files make implicit use
of these.
If you wish to clear the whole symbol table, use the clearall
function.
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