R – tapply

Somehow I have read a post long time ago showing that the importance of understanding all the different types of *pply, like apply, lapply, tapply, vapply..etc. Today, I watched the awesomeness of tapply ‘LIVE’! Also, I really think the people who understand R writes code in an absolute different style from people’s “intuition”. Here is the Stackoverflow post that I got totally blown away.

tapply_vector

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