R add many columns by a function -

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i trying cut number in layers mean next code:

x <- matrix(c(6,7,9,9,9,17,19,4,12,2,3,6,7,7),ncol=2) layers <- c(5,10,15,20,25,30,35,40) partitions <- function(u) {cbind(pmin(layers[1],u),t(diff(pmin(layers,u))))} x <- cbind(x,lapply(x[,2], partitions))

the function returns integer partitioned in layers.

a = a1 + a2 + .... + a8

example 

a <- 19 partitions(a)      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [1,]    5    5    5    4    0    0    0    0

but results not have matrix need. final matrix of 7 x (2 (cols x) + 8 (num of layers in points)) 

     [,1] [,2]      [,3] [1,] 6    numeric,8 null [2,] 7    numeric,8 null [3,] 9    numeric,8 null [4,] 9    numeric,8 null [5,] 9    numeric,8 null [6,] 17   numeric,8 null [7,] 19   numeric,8 null > dim(x) [1] 7 3

i tried different forms , ever had errors of dimensions.

regards

one of these 2 should want

> rbind(t(x),sapply(x[,2], partitions))       [,1] [,2] [,3] [,4] [,5] [,6] [,7]  [1,]    6    7    9    9    9   17   19  [2,]    4   12    2    3    6    7    7  [3,]    4    5    2    3    5    5    5  [4,]    0    5    0    0    1    2    2  [5,]    0    2    0    0    0    0    0  [6,]    0    0    0    0    0    0    0  [7,]    0    0    0    0    0    0    0  [8,]    0    0    0    0    0    0    0  [9,]    0    0    0    0    0    0    0 [10,]    0    0    0    0    0    0    0  > cbind(x,t(sapply(x[,2], partitions)))      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,]    6    4    4    0    0    0    0    0    0     0 [2,]    7   12    5    5    2    0    0    0    0     0 [3,]    9    2    2    0    0    0    0    0    0     0 [4,]    9    3    3    0    0    0    0    0    0     0 [5,]    9    6    5    1    0    0    0    0    0     0 [6,]   17    7    5    2    0    0    0    0    0     0 [7,]   19    7    5    2    0    0    0    0    0     0

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