Dear list,

I have a question regarding how to allocate or initialize the proper type of
the arrays or lists.

I have a for loop, each iteration, I want it to assign a subset of a data
frame to an element of an array or list.
However, I am wondering how I should initialize or allocate the empty array
or list so that it has the same number of the elements as the subsets I am
going to assign and also make the data type is compatible to the subset I am
going to assign to it.
It should look like this:

#initialize or allocate.   ( I don't know how to)
{ some codes: initialize an array or list (which one is better?) with "n"
elements}

#"for" loop for assigning a subset of a large data frame to the elements of
the array or list (which on is better?)
for (i in 1: n){
array[i] <- df[df$V1==A[i],]
}




Thanks.

ZRL

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