Return a corner of a matrix or data frame (i.e., upper left, upper right, lower left, lower right).
Arguments
- x
Data frame or matrix.
- corner
Integer in the set
1, 2, 3, 4or character in the set'topleft', 'topright', 'bottomleft', 'bottomright'or in the set'tl', 'tr', 'bl', 'br'. Indicates which corner to return. Integers 1, 2, 3 and 4 correspond to top left, top right, bottom left, and bottom right corners. The default is 1, the top left corner.- size
Positive integer, number of rows and columns to return. If there are fewer columns/rows than indicated then all columns/rows are returned.
Examples
x <- matrix(1:120, ncol=12, nrow=10)
x
#> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
#> [1,] 1 11 21 31 41 51 61 71 81 91 101 111
#> [2,] 2 12 22 32 42 52 62 72 82 92 102 112
#> [3,] 3 13 23 33 43 53 63 73 83 93 103 113
#> [4,] 4 14 24 34 44 54 64 74 84 94 104 114
#> [5,] 5 15 25 35 45 55 65 75 85 95 105 115
#> [6,] 6 16 26 36 46 56 66 76 86 96 106 116
#> [7,] 7 17 27 37 47 57 67 77 87 97 107 117
#> [8,] 8 18 28 38 48 58 68 78 88 98 108 118
#> [9,] 9 19 29 39 49 59 69 79 89 99 109 119
#> [10,] 10 20 30 40 50 60 70 80 90 100 110 120
corner(x, 1)
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 1 11 21 31 41
#> [2,] 2 12 22 32 42
#> [3,] 3 13 23 33 43
#> [4,] 4 14 24 34 44
#> [5,] 5 15 25 35 45
corner(x, 2)
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 71 81 91 101 111
#> [2,] 72 82 92 102 112
#> [3,] 73 83 93 103 113
#> [4,] 74 84 94 104 114
#> [5,] 75 85 95 105 115
corner(x, 3)
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 6 16 26 36 46
#> [2,] 7 17 27 37 47
#> [3,] 8 18 28 38 48
#> [4,] 9 19 29 39 49
#> [5,] 10 20 30 40 50
corner(x, 4)
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 76 86 96 106 116
#> [2,] 77 87 97 107 117
#> [3,] 78 88 98 108 118
#> [4,] 79 89 99 109 119
#> [5,] 80 90 100 110 120