r Archives - Page 5 of 18

I’m having a little trouble understanding the pass-by-reference properties of data.table. Some operations seem to ‘break’ the reference, and I’d like to understand ...

May 28, 2022
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Programming, r

IT Nursery

Can dplyr package be used for conditional mutating?

Can the mutate be used when the mutation is conditional (depending on the values of certain column values)? This example helps showing what ...

May 28, 2022
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Programming, r

IT Nursery

Explicitly calling return in a function or not

A while back I got rebuked by Simon Urbanek from the R core team (I believe) for recommending a user to explicitly calling ...

May 27, 2022
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Programming, r

IT Nursery

Why use purrr::map instead of lapply?

Is there any reason why I should use map(<list-like-object>, function(x) <do stuff>) instead of lapply(<list-like-object>, function(x) <do stuff>) the output should be the ...

May 27, 2022
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Programming, r

IT Nursery

Numbering rows within groups in a data frame

Working with a data frame similar to this: set.seed(100) df <- data.frame(cat = c(rep("aaa", 5), rep("bbb", 5), rep("ccc", 5)), val = runif(15)) df ...

May 27, 2022
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Programming, r

IT Nursery

Remove NA values from a vector

I have a huge vector which has a couple of NA values, and I’m trying to find the max value in that vector ...

May 27, 2022
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