R Data II 矩阵运算例子 A <matrix(1:6,nrow 2) >X%0%y >A [,1] [,2] [,3] [,4][,5] [,1] [,2] [,3] [1,] 2 4 6 8 10 [2,] 4 8 12 16 20 [1,] 1 3 5 >X<- 1:5 [3,] 6 12 18 24 30 [2,] 2 4 6 >t(A) >y<-2*1:5 [4,] 8 16 24 32 40 [5, 10 20 30 40 50 [,1] [,2] >X%*%y > crossprod(x,y) [1,] 1 2 [,1] [,1] [,2] C,3] [,4] [,5 [2,] 4 4 [1] 24 6 8 3 10 [1,] 110 [2,] 8 12 16 20 [3,] 5 6 > crossprod(x,y) [3,1 6 12 18 [,1] 4,1 8 16 24 4 [5,] 10 20 30 40 50 [1,] 110 outer(x,y,FUN ="*" [,1[,][,3][,4][,5] [1,] 4 6 10 2,] 4 8 12 16 20 det(matrix(1:4,ncol 2)) [3,1 6 12 18 24 30 [1]-2 [4 8 6 32 40 5,3 10 2 30 40 50R Data II 矩阵运算例子