split big matrix in subsets,R -

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i make subgroups matrix， , each subgroup contains same amount of column. example, there matrix 1000 rows , 420 columns, , split 35 sub-matrix in order, first 1 contains first 12 cols, , second contains second 12 cols, , on. think use function iris. please me!

iris[c()]

not sure if you're after, here's reproducible example:

# define matrix m = matrix(       c(1:20),       nrow=2,       ncol=10)   # split 5 submatrices of equal size lapply(split(m, rep(1:5, each = 4)), matrix, ncol = 2) $`1`      [,1] [,2] [1,]    1    3 [2,]    2    4  $`2`      [,1] [,2] [1,]    5    7 [2,]    6    8  $`3`      [,1] [,2] [1,]    9   11 [2,]   10   12  $`4`      [,1] [,2] [1,]   13   15 [2,]   14   16  $`5`      [,1] [,2] [1,]   17   19 [2,]   18   20

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