How to square all the values in a vector in R?

Question

I would like to square every value in data, and I am thinking about using a for loop like this:

data = rnorm(100, mean=0, sd=1)
Newdata = {L = NULL;  for (i in data)  {i = i*i}  L = i  return (L)}

score 62 · Answer 1 · answered Jan 24 '14 at 00:19

62

Try this (faster and simpler):

newData <- data^2

answered Jan 24 '14 at 00:19

Barranka

2

@user3230065 I recommend you take a look to [the Quick R tutorial](http://statmethods.net). – Barranka Jan 24 '14 at 01:09

score 18 · Answer 2 · answered Jan 24 '14 at 00:24

18

This will also work

newData <- data*data

answered Jan 24 '14 at 00:24

Jota

score 9 · Answer 3 · answered Jan 24 '14 at 00:56

9

How about sapply (not really necessary for this simple case):

newData<- sapply(data, function(x) x^2)

answered Jan 24 '14 at 00:56

desired login

I don't know how this is even different/better from the answer provided by @Barranka – Ronak Shah Dec 28 '16 at 09:26
1

its will be even slower than the vectorized implementation. sapply is an compact way of writing a loop! – David Jan 24 '17 at 06:35

score 0 · Answer 4 · edited Aug 01 '20 at 04:37

0

This is another simple way:

sq_data <- data**2

edited Aug 01 '20 at 04:37

answered Aug 01 '20 at 01:26

RICARDO LINO

4 Answers4