subset()函數(shù)在構(gòu)建矩陣的子集
請(qǐng)問怎樣用subset()函數(shù)構(gòu)建一個(gè)矩陣中某行或某列的子集，調(diào)用某行或某列的函數(shù)是什么？
慕哥2441251
2019-07-29
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2020-05-12
> subset(titanic,titanic$Class=="1st") #subset里的第一個(gè)參數(shù)是矩陣或向量或數(shù)據(jù)框，第二個(gè)參數(shù)是判斷語句
? ?Class? ? Sex? ?Age Survived Freq
1? ? 1st? ?Male Child? ? ? ?No? ? 0
5? ? 1st Female Child? ? ? ?No? ? 0
9? ? 1st? ?Male Adult? ? ? ?No? 118
13? ?1st Female Adult? ? ? ?No? ? 4
17? ?1st? ?Male Child? ? ? Yes? ? 5
21? ?1st Female Child? ? ? Yes? ? 1
25? ?1st? ?Male Adult? ? ? Yes? ?57
29? ?1st Female Adult? ? ? Yes? 140
2020-05-12
> subset(titanic,titanic$Class=="1st") #第一個(gè)參數(shù)是數(shù)據(jù)框或向量或矩陣，第二個(gè)參數(shù)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