In order to pinpoint missing functionality, the R core team uses these functions for missing R functions and not yet used arguments of existing R functions (which are typically there for compatibility purposes).
You are very welcome to contribute your code ...
.NotYetImplemented() .NotYetUsed(arg, error = TRUE)
an argument of a function that is not yet used.
a logical. If
Defunct for outdated code.
require(graphics) barplot(1:5, inside = TRUE) # 'inside' is not yet used
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