How to find the indices that were not chosen by sample in R

Asked Nov 23 '20 at 15:18

Active Nov 23 '20 at 15:18

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I am using the sample function to extract rows from a dataframe (dat) with 1010 rows. By using:

idx <- sample(1:nrow(dat), 707))

I extract 707 indices at random. How can I easily get the complement of such indexes? That is, the numbers from 1 to 1010 that were not chosen and are not in idx.

asked Nov 23 '20 at 15:18

jeongbyulji

2

setdiff(1:1010, idx) – EugenR Nov 23 '20 at 15:21
Does this answer your question? [How to tell what is in one vector and not another?](https://stackoverflow.com/questions/1837968/how-to-tell-what-is-in-one-vector-and-not-another) – camille Nov 23 '20 at 16:33
In practice you can do `dat[-idx, ]` to get the other rows. – s_baldur Nov 24 '20 at 14:56

How to find the indices that were not chosen by sample in R

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