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The comments by both Michael E2 and J. M. ♦ are already an excellent answer, so this is just my attempt at summarizing. Undocumented means just what it says: there need not be any reference pages or usage messages, or any other kind of documentation. There are many undocumented functions and if you follow MSE regularly, you will encounter them often. Using ...


How should I know the correct order of arguments without trying several times? You can't, usually. A lot of the undocumented usage that you see on this site will have been worked out by trial and error. Sometimes it is fruitless - I have explored plenty of interesting-sounding internal functions and got nowhere. Are there detailed usage information of ...

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