learning R with swirl-vapply and tapply（不懂）
上一章，我们学了apply家族里比较基础的两个函数：lapply()和sapply()。它们都是以一个列表作为输入，对列表中的每个元素采取某种函数操作。然后合并并返回结果。lapply()结果返回一个列表，而sapply()尝试简化这个列表。 本题选3，氮素不知道为什么！ 本题选5，也不知道为什么！！！！！
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相关文章
- 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
- 6. learning r with swirl -basic building blocks
- 7. 8 Planning and Learning with Tabular Methods
- 8. Machine and Deep Learning with Python
- 9. learning R with swirl-sequences of numbers
- 10. learning R with swirl-missing value