Removes n rows and columns with NA values on all sides of a matrix.
matrix_trim(m, n = 1)A matrix
By how many rows/columns to trim the matrix on each side?
A trimmed matrix, or NULL if trimming results in an "empty" matrix.
m = matrix(1:80, nrow = 8, ncol = 10)
m
#> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
#> [1,] 1 9 17 25 33 41 49 57 65 73
#> [2,] 2 10 18 26 34 42 50 58 66 74
#> [3,] 3 11 19 27 35 43 51 59 67 75
#> [4,] 4 12 20 28 36 44 52 60 68 76
#> [5,] 5 13 21 29 37 45 53 61 69 77
#> [6,] 6 14 22 30 38 46 54 62 70 78
#> [7,] 7 15 23 31 39 47 55 63 71 79
#> [8,] 8 16 24 32 40 48 56 64 72 80
matrix_trim(m, 1)
#> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8]
#> [1,] 10 18 26 34 42 50 58 66
#> [2,] 11 19 27 35 43 51 59 67
#> [3,] 12 20 28 36 44 52 60 68
#> [4,] 13 21 29 37 45 53 61 69
#> [5,] 14 22 30 38 46 54 62 70
#> [6,] 15 23 31 39 47 55 63 71
matrix_trim(m, 2)
#> [,1] [,2] [,3] [,4] [,5] [,6]
#> [1,] 19 27 35 43 51 59
#> [2,] 20 28 36 44 52 60
#> [3,] 21 29 37 45 53 61
#> [4,] 22 30 38 46 54 62
matrix_trim(m, 3)
#> [,1] [,2] [,3] [,4]
#> [1,] 28 36 44 52
#> [2,] 29 37 45 53
matrix_trim(m, 4)
#> NULL