head and tail for matrices

head and tail for matrices

head2(x, n = 6, m = n)

tail2(x, n = 6, m = n)

Arguments

x

matrix

n, m

number of rows and columns

Examples

M <- matrix(1:20, nrow=4)
head2(M)
#>      [,1] [,2] [,3] [,4] [,5]
#> [1,]    1    5    9   13   17
#> [2,]    2    6   10   14   18
#> [3,]    3    7   11   15   19
#> [4,]    4    8   12   16   20
head2(M, 2)
#>      [,1] [,2]
#> [1,]    1    5
#> [2,]    2    6