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請問怎樣用subset()函數構建一個矩陣中某行或某列的子集，調用某行或某列的函數是什么？
2019-07-29
源自：R語言基礎 3-3
正在回答
> subset(titanic,titanic$Class=="1st") #subset里的第一個參數是矩陣或向量或數據框，第二個參數是判斷語句
? ?Class? ? Sex? ?Age Survived Freq
1? ? 1st? ?Male Child? ? ? ?No? ? 0
5? ? 1st Female Child? ? ? ?No? ? 0
9? ? 1st? ?Male Adult? ? ? ?No? 118
13? ?1st Female Adult? ? ? ?No? ? 4
17? ?1st? ?Male Child? ? ? Yes? ? 5
21? ?1st Female Child? ? ? Yes? ? 1
25? ?1st? ?Male Adult? ? ? Yes? ?57
29? ?1st Female Adult? ? ? Yes? 140
> subset(titanic,titanic$Class=="1st") #第一個參數是數據框或向量或矩陣，第二個參數是判斷語句
舉報
本R語言基礎教程，教你如何在R中操縱自己數據，快速入門
2 回答關于矩陣子集
2 回答3-2矩陣的子集中有誤
2 回答請問Rstudio中矩陣轉置函數是什么？
1 回答data.matrix把數據框變為矩陣后怎么使用這個矩陣，矩陣的名字是啥啊老師
2 回答矩陣拼接的行列問題
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2020-05-12
> subset(titanic,titanic$Class=="1st") #subset里的第一個參數是矩陣或向量或數據框，第二個參數是判斷語句
? ?Class? ? Sex? ?Age Survived Freq
1? ? 1st? ?Male Child? ? ? ?No? ? 0
5? ? 1st Female Child? ? ? ?No? ? 0
9? ? 1st? ?Male Adult? ? ? ?No? 118
13? ?1st Female Adult? ? ? ?No? ? 4
17? ?1st? ?Male Child? ? ? Yes? ? 5
21? ?1st Female Child? ? ? Yes? ? 1
25? ?1st? ?Male Adult? ? ? Yes? ?57
29? ?1st Female Adult? ? ? Yes? 140
2020-05-12
> subset(titanic,titanic$Class=="1st") #第一個參數是數據框或向量或矩陣，第二個參數是判斷語句
? ?Class? ? Sex? ?Age Survived Freq
1? ? 1st? ?Male Child? ? ? ?No? ? 0
5? ? 1st Female Child? ? ? ?No? ? 0
9? ? 1st? ?Male Adult? ? ? ?No? 118
13? ?1st Female Adult? ? ? ?No? ? 4
17? ?1st? ?Male Child? ? ? Yes? ? 5
21? ?1st Female Child? ? ? Yes? ? 1
25? ?1st? ?Male Adult? ? ? Yes? ?57
29? ?1st Female Adult? ? ? Yes? 140