R語言從基礎入門到提高（三）Vectors（向量）
阿新 • • 發佈：2019-01-29
Working with comparisons will make your data analytical life easier. Instead of selecting a subset（子集） of days to investigate（研究） yourself (like before), you can simply ask R to return only those days where you realized a positive return for poker.
In the previous exercises you used selection_vector <- poker_vector > 0
You can select the desired（渴望的） elements, by putting selection_vectorbetween
the square brackets that follow poker_vector:
R knows what to do when you pass a logical vector in square brackets: it will only select the elements that correspond to（對應是）poker_vector[selection_vector]
TRUE in selection_vector.