# Nested lists code, an example # Make a nested list mylist <- list() mylist_ <- list() for(i in 1:5) { for(j in 1:5) { mylist[[j]] <- i*j } mylist_[[i]] <- mylist } # return values from first part of list laply(mylist_[[1]], identity) [1] 1 2 3 4 5

# return all values laply(mylist_, function(x) laply(x, identity)) 1 2 3 4 5 [1,] 1 2 3 4 5 [2,] 2 4 6 8 10 [3,] 3 6 9 12 15 [4,] 4 8 12 16 20 [5,] 5 10 15 20 25

# perform some function, in this case sqrt of each value laply(mylist_, function(x) laply(x, function(x) sqrt(x)))

```
1 2 3 4 5
[1,] 1.000000 1.414214 1.732051 2.000000 2.236068
[2,] 1.414214 2.000000 2.449490 2.828427 3.162278
[3,] 1.732051 2.449490 3.000000 3.464102 3.872983
[4,] 2.000000 2.828427 3.464102 4.000000 4.472136
[5,] 2.236068 3.162278 3.872983 4.472136 5.000000
```

Created by Pretty R at inside-R.org

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