commas <- function(...) stringr::str_c(..., collapse = ", ")
no braces needed for function on a single line
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- Feb 2020
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r4ds.had.co.nz r4ds.had.co.nz
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r4ds.had.co.nz r4ds.had.co.nz
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it’s the same as the input!
because we want to modify columns in place
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Compute the mean of every column in mtcars.
output <- vector("double", ncol(mtcars)) # 1. output for (i in seq_along(mtcars)) { # 2. sequence output[[i]] <- mean(mtcars[[i]]) # 3. body }
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- Jul 2019
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r4ds.had.co.nz r4ds.had.co.nz
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The book is written in RMarkdown with bookdown. It is automatically rebuilt from source by travis. R4DS is a collaborative effort and many people have contributed fixes and improvements via pull request.
anyone other r4ds_slackers using bookdown?
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Anyone in the Slack group interested in sharing comments directly on this page via this hypothesis tool? We can use the tag "r4ds_slackers"
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