Now i have a list like below:
mylist
[[1]]
[1] 0 1 0 1 1 0 0 1 0
[[2]]
[1] 0 1 0 1 0 1 0 1 1
...
I would like to make every list into a 3*3 matrix by a for loop function like:
for (i in 1:N){
m[i]=matrix(mylist[[i]],nrow=3,ncol=3,byrow=TRUE)
}
But it doesn't work out?
What else i can do ?
Thanks for helping in advance!
You don't need a for loop for that. You can use lapply:
## First, make up some sample data
set.seed(1)
mylist <- replicate(2, sample(0:1, 9, TRUE), FALSE)
## Let's work on a copy in case you need the original
m <- mylist
m
# [[1]]
# [1] 0 0 1 1 0 1 1 1 1
#
# [[2]]
# [1] 0 0 0 1 0 1 0 1 1
## Here's the actual transformation
m[] <- lapply(m, matrix, nrow = 3, byrow = TRUE)
m
# [[1]]
# [,1] [,2] [,3]
# [1,] 0 0 1
# [2,] 1 0 1
# [3,] 1 1 1
#
# [[2]]
# [,1] [,2] [,3]
# [1,] 0 0 0
# [2,] 1 0 1
# [3,] 0 1 1
m=list()
for (i in 1:length(mylist) ){
m[[i]] = matrix( mylist[[i]], nrow=3, ncol=3, byrow=TRUE)
}
> m
[[1]]
[,1] [,2] [,3]
[1,] 0 0 1
[2,] 1 0 1
[3,] 1 1 1
[[2]]
[,1] [,2] [,3]
[1,] 0 0 0
[2,] 1 0 1
[3,] 0 1 1
