CODEWITHSUNDEEP
r
user2498497
user2498497

Reputation: 703

Store/make sparse vector in R

I am generating a sparse vector length >50,000. I am producing it in a for loop. I wonder if there is an efficient way of storing the zeros?

Basically the code looks like

score = c()
for (i in 1:length(someList)) {
score[i] = getScore(input[i], other_inputs)
if (score[i] == numeric(0))
score[i] = 0    ###I would want to do something about the zeros
}

Upvotes: 2

Views: 903

Answers (1)

agstudy
agstudy

Reputation: 121608

This code will not work. You should preallocate score vector size before looping. Preallocating also will create a vector with zeros. So, no need to assign zeros values, you can only assign numeric results from getScore function.

N <- length(someList)  ## create a vector with zeros
score = vector('numeric',N)
for (i in 1:N) {
  ss <- getScore(input[i], other_inputs)
  if (length(ss)!=0)
    score[i] <- ss  
}

Upvotes: 1

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