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rlistfor-loopforecasting

For loop to create lists

Suppose you have the following dataframe:

data <- data.frame(a=runif(n=348), b=runif(n=348), c=runif(n=348))

and then suppose that you would like to apply the bld.mbb.bootstrap function (from forecast package) for every column.

With one column the code will go like this:

reps <- 500L
sim <- bld.mbb.bootstrap(data$a, reps)

Which returns a list of 500.

Question 1: How do I get to change all the names? To say iteration #i (inside the list).

Question 2: I want to make a for loop that does "sim" for all the columns in the dataframe. So I think it'd go like this:

for (i in names(data)){

sim <- bld.mbb.bootstrap(data$i, reps)

}

How can I make a list that stores (in this case 3) lists?

I want a list that contains 3 lists named like the variable: a, b, and c.

where a, b, c are lists that contain the iterations.

Thanks in advance!

Solution

  • A base R approach using lapply

    lapply(data, function(x) bld.mbb.bootstrap(x, reps))

    or

    setNames(lapply(colnames(data), function(x) 
  bld.mbb.bootstrap(data[,x], reps)), colnames(data))