learning R with swirl-vapply and tapply（不懂）
上一章，我們學了apply家族裏比較基礎的兩個函數：lapply()和sapply()。它們都是以一個列表作爲輸入，對列表中的每個元素採取某種函數操作。然後合併並返回結果。lapply()結果返回一個列表，而sapply()嘗試簡化這個列表。 本題選3，氮素不知道爲什麼！ 本題選5，也不知道爲什麼！！！！！
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相關文章
- 1. learning R with lapply and sapply（不懂）
- 2. learning R with swirl-workspace and files
- 3. learning R with swirl-dates and times
- 4. learning R with swirl-functions
- 5. learning R with swirl-logic
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- 7. 8 Planning and Learning with Tabular Methods
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- 9. learning R with swirl-sequences of numbers
- 10. learning R with swirl-missing value