通过合并行意味着我们要连接矩阵的行，但是像在原始矩阵中那样创建单独的列。例如，如果我们有两个矩阵，请说M1和M2，如下所示-
M1 1 2 3 3 2 1 M2 2 3 5 1 2 3
然后通过合并行将这两个矩阵合并将导致-
1 2 3 2 3 5 3 2 1 1 2 3
> M1<-matrix(rpois(40,5),nrow=20) > M1输出结果
[,1] [,2] [1,] 5 2 [2,] 7 4 [3,] 3 6 [4,] 7 7 [5,] 5 3 [6,] 2 7 [7,] 4 7 [8,] 10 7 [9,] 7 2 [10,] 2 4 [11,] 7 5 [12,] 1 6 [13,] 2 3 [14,] 4 6 [15,] 7 6 [16,] 5 7 [17,] 3 2 [18,] 7 4 [19,] 9 6 [20,] 5 6
> M2<-matrix(rpois(40,5),nrow=20) > M2输出结果
[,1] [,2] [1,] 4 7 [2,] 2 9 [3,] 5 3 [4,] 2 10 [5,] 5 2 [6,] 5 5 [7,] 3 7 [8,] 6 5 [9,] 4 4 [10,] 5 0 [11,] 3 3 [12,] 5 2 [13,] 3 8 [14,] 2 6 [15,] 2 4 [16,] 10 5 [17,] 5 8 [18,] 1 4 [19,] 6 6 [20,] 4 6
按行合并M1和M2-
> merge(M1,M2,by="row.names",all=TRUE)输出结果
Row.names V1.xV2.xV1.y V2.y 1 1 5 2 4 7 2 10 2 4 5 0 3 11 7 5 3 3 4 12 1 6 5 2 5 13 2 3 3 8 6 14 4 6 2 6 7 15 7 6 2 4 8 16 5 7 10 5 9 17 3 2 5 8 10 18 7 4 1 4 11 19 9 6 6 6 12 2 7 4 2 9 13 20 5 6 4 6 14 3 3 6 5 3 15 4 7 7 2 10 16 5 5 3 5 2 17 6 2 7 5 5 18 7 4 7 3 7 19 8 10 7 6 5 20 9 7 2 4 4
> M3<-matrix(rpois(40,1),nrow=20) > M3输出结果
[,1] [,2] [1,] 0 1 [2,] 0 1 [3,] 3 0 [4,] 2 0 [5,] 0 1 [6,] 2 1 [7,] 1 0 [8,] 2 0 [9,] 2 1 [10,] 0 1 [11,] 3 0 [12,] 2 0 [13,] 2 0 [14,] 1 2 [15,] 1 2 [16,] 0 1 [17,] 4 1 [18,] 1 1 [19,] 1 2 [20,] 1 1
> M4<-matrix(rpois(40,1),nrow=20) > M4输出结果
[,1] [,2] [1,] 1 0 [2,] 2 2 [3,] 1 0 [4,] 1 0 [5,] 0 2 [6,] 1 1 [7,] 2 0 [8,] 2 1 [9,] 0 0 [10,] 0 1 [11,] 3 0 [12,] 3 2 [13,] 3 5 [14,] 0 0 [15,] 2 1 [16,] 0 0 [17,] 1 1 [18,] 0 0 [19,] 1 1 [20,] 1 2
按行合并M3和M4-
> merge(M3,M4,by="row.names",all=TRUE)输出结果
Row.names V1.xV2.xV1.y V2.y 1 1 0 1 1 0 2 10 0 1 0 1 3 11 3 0 3 0 4 12 2 0 3 2 5 13 2 0 3 5 6 14 1 2 0 0 7 15 1 2 2 1 8 16 0 1 0 0 9 17 4 1 1 1 10 18 1 1 0 0 11 19 1 2 1 1 12 2 0 1 2 2 13 20 1 1 1 2 14 3 3 0 1 0 15 4 2 0 1 0 16 5 0 1 0 2 17 6 2 1 1 1 18 7 1 0 2 0 19 8 2 0 2 1 20 9 2 1 0 0