R function arguments' range or pre-conditions -



R function arguments' range or pre-conditions -

i matlab, java, python user, started learning r. find annoying not beingness able see allowed input parameter values.

i know can phone call ?afunction or args(afunction) not seem complete. i'll give example.

png has input argument bg default set white, turns out can set black, transparent, red, etc follows in no way documentation or args()-call.

now question not png example, question is: there more informative (meta)-functions args , help tell user "ah, these allowed values parameter", and, "aha, argument needs of type numeric"?

r function documentation arguments args

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