下面哪个函数可以用来生成矩阵() A: t() B: dim() C: matrix() D: dimnames()
下面哪个函数可以用来生成矩阵() A: t() B: dim() C: matrix() D: dimnames()
a1[-c("A1","A2")] a2[-c("B1","B2","B3") ] a3[-c("C1","C2") ] myarry<-array(1:12,c(2,3,2),dimnames<-list(a1,a2,a3)) 后执行代码 myarry[1,,1]得到的结果,下列说法正确的是() A: 10 B: C1 C2 C3 2 4 6 C: A1 A2 A3 1 3 5 D: B1 B2 B3 1 3 5
a1[-c("A1","A2")] a2[-c("B1","B2","B3") ] a3[-c("C1","C2") ] myarry<-array(1:12,c(2,3,2),dimnames<-list(a1,a2,a3)) 后执行代码 myarry[1,,1]得到的结果,下列说法正确的是() A: 10 B: C1 C2 C3 2 4 6 C: A1 A2 A3 1 3 5 D: B1 B2 B3 1 3 5
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