learning R with swirl-subsetting vectors(子集向量)
這一次，我們學習從向量組中抽出特定的向量，例如我們只對向量前20個元素感興趣，或者對向量中NA值感興趣。 你告訴R想要挑選哪些特殊的向量是通過在向量名的方括號裏放置索引向量所知道的。例如： 索引向量有四種不同的類型，邏輯向量，正整數向量，負整數向量，字符串向量。 首先我們先來講邏輯向量：原先我們學過的is.na()是在NA的地方輸出TRUE,在有值的地方輸出FALSE，
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相關文章
- 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(模擬)
- 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