CODEWITHSUNDEEP
rrandomvector
Michael Discenza
Michael Discenza

Reputation: 3330

Creating a list of random vectors in R

I am trying to create a list 1000 entries long where each entry of the list a random vector. In this case the vector should be a 10 integers chosen from the integers 1 to 100. I want to avoid doing this in a loop.

If I run the following, this does not sample again, but just replicates the sample across all 1000 entries of the list:

list.of.samples <- rep(list(sample(1:100,size=10)),1000)

Is there an easy way that I am missing to vectorize the generation of these 1000 samples and store them in a list?

Upvotes: 7

Views: 4747

Answers (3)

rahul-ahuja
rahul-ahuja

Reputation: 1424

To create a vector with letters:

library(wakefield)
c = lower(10, k=3)   # generates 10 random letters from the first 3
c
#> "b" "a" "a" "a" "a" "b" "c" "b" "a" "b"

Upvotes: 0

pteetor
pteetor

Reputation: 511

In cases like this, I often use the replicate function:

list.of.samples <- replicate(1000, sample(1:100,size=10), simplify=FALSE)

It repeatedly evaluates its second argument. Setting simplify=FALSE means you get back a list, not an array.

Upvotes: 12

sharoz
sharoz

Reputation: 6345

rep will repeat whatever is given. lapply should do what you want.

list.of.samples = lapply(1:1000, function(x) sample(1:100,size=10))

Upvotes: 3

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