如何使用R中的字符串值向量创建矩阵？
您可能听说过矩阵只能包含数字值，但是也可以创建带有字符串值的矩阵，并且当然不可能使用这些类型的矩阵进行计算。要使用字符串值创建矩阵，我们可以先创建一个字符串向量，然后使用dim函数定义维数，然后将向量转换为字符串值矩阵。
示例
M1<-rep(c("A","B","C","D","E"),each=5)
M1输出结果
[1] "A" "A" "A" "A" "A" "B" "B" "B" "B" "B" "C" "C" "C" "C" "C" "D" "D" "D" "D" [20] "D" "E" "E" "E" "E" "E"
示例
dim(M1)<-c(5,5) M1
输出结果
[,1] [,2] [,3] [,4] [,5] [1,] "A" "B" "C" "D" "E" [2,] "A" "B" "C" "D" "E" [3,] "A" "B" "C" "D" "E" [4,] "A" "B" "C" "D" "E" [5,] "A" "B" "C" "D" "E"
is.matrix(M1)[1]是
示例
M2<-sample(c("A","B","C","D"),36,replace=TRUE)
M2输出结果
[1] "C" "A" "B" "C" "B" "D" "A" "D" "A" "A" "D" "D" "A" "D" "C" "D" "D" "D" "C" [20] "C" "C" "B" "A" "A" "D" "A" "C" "B" "D" "D" "C" "D" "D" "C" "C" "C"
示例
dim(M2)<-c(6,6) M2
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [1,] "D" "A" "C" "A" "B" "C" [2,] "D" "B" "B" "D" "A" "B" [3,] "C" "B" "B" "A" "D" "C" [4,] "D" "D" "C" "B" "A" "B" [5,] "C" "B" "A" "A" "D" "A" [6,] "A" "B" "B" "A" "A" "D"
is.matrix(M2)[1]是
示例
M3<-sample(letters[1:10],60,replace=TRUE) M3
输出结果
[1] "d" "a" "d" "b" "b" "c" "j" "d" "h" "f" "f" "b" "a" "i" "h" "i" "e" "h" "d" [20] "a" "i" "g" "a" "g" "h" "h" "e" "g" "a" "g" "c" "i" "j" "d" "e" "f" "b" "b" [39] "i" "d" "d" "e" "d" "e" "g" "g" "j" "g" "a" "g" "j" "j" "d" "c" "b" "j" "h" [58] "f" "e" "a"
示例
dim(M3)<-c(10,6) M3
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [1,] "f" "h" "a" "f" "d" "c" [2,] "e" "h" "g" "b" "i" "e" [3,] "b" "j" "h" "h" "h" "g" [4,] "i" "f" "d" "i" "c" "d" [5,] "j" "f" "j" "b" "j" "d" [6,] "a" "d" "c" "j" "e" "j" [7,] "b" "i" "j" "i" "e" "c" [8,] "c" "i" "d" "i" "b" "a" [9,] "g" "f" "a" "d" "d" "j" [10,] "d" "f" "e" "b" "f" "i"
is.matrix(M3)[1]是
示例
M4<-sample(LETTERS[1:26],100,replace=TRUE)M4
输出结果
[1] "J" "R" "D" "B" "Z" "F" "V" "M" "U" "M" "X" "A" "L" "L" "N" "G" "O" "H" [19] "J" "C" "Y" "L" "I" "N" "Y" "D" "E" "N" "U" "Q" "Y" "X" "J" "O" "T" "Q" [37] "X" "H" "V" "Z" "I" "P" "J" "Q" "Z" "G" "J" "V" "U" "P" "X" "P" "K" "O" [55] "Y" "L" "E" "B" "B" "P" "Y" "D" "M" "S" "U" "K" "D" "N" "B" "B" "P" "V" [73] "O" "Z" "L" "L" "G" "J" "Y" "Z" "K" "C" "Z" "Q" "Y" "C" "G" "H" "F" "J" [91] "Q" "W" "Q" "H" "H" "Q" "O" "M" "I" "S"
示例
dim(M4)<-c(10,10) M4
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] "I" "K" "A" "X" "X" "N" "Y" "U" "U" "P" [2,] "Y" "R" "Q" "Y" "V" "M" "T" "L" "X" "X" [3,] "F" "H" "E" "N" "V" "G" "A" "G" "Y" "P" [4,] "C" "D" "K" "E" "P" "M" "S" "B" "K" "Z" [5,] "W" "C" "G" "H" "J" "E" "U" "G" "C" "Q" [6,] "D" "T" "J" "V" "D" "A" "L" "S" "I" "P" [7,] "N" "T" "W" "T" "J" "T" "R" "E" "S" "S" [8,] "W" "N" "P" "O" "B" "E" "M" "W" "G" "P" [9,] "I" "I" "N" "M" "I" "L" "W" "E" "D" "W" [10,] "E" "Y" "B" "T" "M" "C" "F" "P" "R" "L"
is.matrix(M4)[1]是
示例
M5<-sample(c("India","Russia","China","Denmark"),60,replace=TRUE)
M5输出结果
[1] "China" "Denmark" "China" "China" "Russia" "Russia" "Denmark" [8] "China" "Russia" "Russia" "Denmark" "India" "China" "Russia" [15] "India" "China" "China" "China" "Russia" "India" "India" [22] "Denmark" "Russia" "Russia" "Russia" "China" "China" "India" [29] "Russia" "Denmark" "Russia" "Russia" "China" "India" "Russia" [36] "Russia" "Russia" "India" "China" "Denmark" "Russia" "China" [43] "India" "Russia" "China" "China" "China" "Russia" "India" [50] "Denmark" "India" "China" "India" "Denmark" "Denmark" "Denmark" [57] "Denmark" "India" "Russia" "China"
示例
dim(M5)<-c(10,6) M5
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [1,] "India" "China" "India" "Russia" "Denmark" "Denmark" [2,] "Russia" "Denmark" "Russia" "Russia" "Denmark" "India" [3,] "China" "India" "China" "China" "Denmark" "Denmark" [4,] "Denmark" "India" "Russia" "India" "Denmark" "China" [5,] "Russia" "China" "Russia" "China" "Russia" "China" [6,] "Denmark" "China" "Russia" "Denmark" "Denmark" "China" [7,] "Denmark" "Russia" "China" "India" "China" "China" [8,] "Denmark" "China" "Denmark" "India" "India" "Denmark" [9,] "Denmark" "India" "Denmark" "India" "Russia" "China" [10,] "Russia" "Denmark" "China" "India" "Denmark" "India"
is.matrix(M5)[1]是
示例
M6<-sample(c("Cold","Winter","Hot"),40,replace=TRUE)
M6输出结果
[1] "Hot" "Cold" "Hot" "Winter" "Winter" "Hot" "Cold" "Winter" [9] "Hot" "Winter" "Cold" "Winter" "Hot" "Winter" "Hot" "Winter" [17] "Hot" "Winter" "Cold" "Cold" "Winter" "Cold" "Cold" "Hot" [25] "Hot" "Hot" "Hot" "Hot" "Cold" "Winter" "Winter" "Cold" [33] "Cold" "Winter" "Winter" "Hot" "Hot" "Hot" "Hot" "Hot"
示例
dim(M6)<-c(10,4) M6
输出结果
[,1] [,2] [,3] [,4] [1,] "Hot" "Hot" "Cold" "Winter" [2,] "Hot" "Hot" "Winter" "Winter" [3,] "Winter" "Cold" "Winter" "Cold" [4,] "Cold" "Cold" "Hot" "Winter" [5,] "Hot" "Cold" "Cold" "Hot" [6,] "Cold" "Winter" "Hot" "Cold" [7,] "Winter" "Winter" "Cold" "Hot" [8,] "Cold" "Cold" "Cold" "Hot" [9,] "Cold" "Cold" "Winter" "Cold" [10,] "Cold" "Winter" "Winter" "Hot"
is.matrix(M6)[1]是