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How to check in R whether a matrix element is present in another matrix or not?
We can use %in% to check whether a matrix element is present in another matrix or not. For example, suppose we have two matrices defined as −
M1 1 2 3 1 2 3 1 2 3 M2 1 2 3 4 5 6 7 8 9
Then M1%in%M2 will return −
[1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
But M2%in%M1 will return −
[1] TRUE FALSE FALSE TRUE FALSE FALSE TRUE FALSE FALSE
Example1
M1<−matrix(1:25,ncol=5,byrow=TRUE) M1 [,1] [,2] [,3] [,4] [,5] [1,] 1 2 3 4 5 [2,] 6 7 8 9 10 [3,] 11 12 13 14 15 [4,] 16 17 18 19 20 [5,] 21 22 23 24 25 M2<−matrix(1:50,ncol=5,byrow=TRUE) M2 [,1] [,2] [,3] [,4] [,5] [1,] 1 2 3 4 5 [2,] 6 7 8 9 10 [3,] 11 12 13 14 15 [4,] 16 17 18 19 20 [5,] 21 22 23 24 25 [6,] 26 27 28 29 30 [7,] 31 32 33 34 35 [8,] 36 37 38 39 40 [9,] 41 42 43 44 45 [10,] 46 47 48 49 50 M1%in%M2 [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [16] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE M2%in%M1 [1] TRUE TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE FALSE TRUE TRUE [13] TRUE TRUE TRUE FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE TRUE [25] TRUE FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE TRUE TRUE FALSE [37] FALSE FALSE FALSE FALSE TRUE TRUE TRUE TRUE TRUE FALSE FALSE FALSE [49] FALSE FALSE
Example2
M3<−matrix(rpois(40,5),ncol=4,byrow=TRUE) M3 [,1] [,2] [,3] [,4] [1,] 4 7 7 6 [2,] 5 4 5 2 [3,] 6 3 5 5 [4,] 8 6 6 6 [5,] 3 6 3 6 [6,] 5 3 7 8 [7,] 9 4 6 2 [8,] 4 6 2 4 [9,] 3 2 4 7 [10,] 6 10 3 2 M4<−matrix(rpois(24,5),ncol=4,byrow=TRUE) M4 [,1] [,2] [,3] [,4] [1,] 4 8 7 5 [2,] 9 3 8 9 [3,] 6 2 1 5 [4,] 2 10 7 1 [5,] 5 4 7 7 [6,] 4 5 12 6 M3%in%M4 [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [16] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [31] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE M4%in%M3 [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [13] TRUE TRUE FALSE TRUE TRUE FALSE TRUE TRUE TRUE FALSE TRUE TRUE
Example3
M6<−matrix(rpois(35,6),ncol=7,byrow=TRUE) M6 [,1] [,2] [,3] [,4] [,5] [,6] [,7] [1,] 6 5 9 5 2 4 7 [2,] 7 5 8 8 8 7 5 [3,] 10 4 6 9 8 10 4 [4,] 7 8 9 5 7 6 8 [5,] 6 3 5 8 9 7 6 M7<−matrix(rpois(63,8),ncol=7,byrow=TRUE) M7 [,1] [,2] [,3] [,4] [,5] [,6] [,7] [1,] 7 10 7 10 12 7 8 [2,] 6 7 6 6 7 10 9 [3,] 12 11 7 8 12 6 6 [4,] 6 6 8 13 6 10 5 [5,] 7 7 11 12 10 3 8 [6,] 14 3 11 10 10 3 8 [7,] 9 12 6 8 4 13 7 [8,] 8 10 12 3 4 4 7 [9,] 8 9 10 9 7 7 9 M6%in%M7 [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [13] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE FALSE TRUE TRUE TRUE [25] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE M7%in%M6 [1] TRUE TRUE FALSE TRUE TRUE FALSE TRUE TRUE TRUE TRUE TRUE FALSE [13] TRUE TRUE TRUE FALSE TRUE TRUE TRUE TRUE TRUE TRUE FALSE FALSE [25] TRUE FALSE TRUE TRUE TRUE TRUE FALSE FALSE TRUE TRUE TRUE TRUE [37] FALSE TRUE FALSE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [49] TRUE TRUE TRUE FALSE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [61] TRUE TRUE TRUE
Updated on: 06-Nov-2020
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