learning R with swirl-subsetting vectors(子集向量)
这一次，我们学习从向量组中抽出特定的向量，例如我们只对向量前20个元素感兴趣，或者对向量中NA值感兴趣。 你告诉R想要挑选哪些特殊的向量是通过在向量名的方括号里放置索引向量所知道的。例如： 索引向量有四种不同的类型，逻辑向量，正整数向量，负整数向量，字符串向量。 首先我们先来讲逻辑向量：原先我们学过的is.na()是在NA的地方输出TRUE,在有值的地方输出FALSE，
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相关文章
- 1. learning R with swirl-logic
- 2. learning R with swirl-functions
- 3. learning R with swirl-dates and times
- 4. Working with vectors
- 5. learning R with swirl-simulation(模拟)
- 6. learning R with swirl-looking at data
- 7. learning r with swirl -basic building blocks
- 8. learning R with swirl-sequences of numbers
- 9. learning R with swirl-workspace and files
- 10. learning R with swirl-missing value