Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

programming vignette tweak #5010

Merged
merged 4 commits into from May 23, 2021
Merged

programming vignette tweak #5010

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
a2f743a
docs update
jangorecki May 18, 2021
44c1d7a
docs update2
jangorecki May 18, 2021
f4a9e06
Merge branch 'master' into programming-ver
mattdowle May 23, 2021
ac1c0c5
1.15.0 => 1.14.2
mattdowle May 23, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
4 changes: 3 additions & 1 deletion _pkgdown.yml
View file
Open in desktop
Expand Up @@ -36,8 +36,10 @@ navbar:
href: articles/datatable-keys-fast-subset.html
- text: "Secondary indices and auto indexing"
href: articles/datatable-secondary-indices-and-auto-indexing.html
- text: "Efficient reshaping using data.tables"
- text: "Efficient reshaping using data.table"
href: articles/datatable-reshape.html
- text: "Programming on data.table"
href: articles/datatable-programming.html
- text: "Frequently asked questions"
href: articles/datatable-faq.html
- text: "Importing data.table"
Expand Down
2 changes: 1 addition & 1 deletion vignettes/datatable-programming.Rmd
View file
Open in desktop
Expand Up @@ -114,7 +114,7 @@ Though these can be helpful, we will be discussing a `data.table`-unique approac

Now that we've established the proper way to parameterize code that uses *lazy evaluation*, we can move on to the main subject of this vignette, *programming on data.table*.

Starting from version 1.12.10, data.table provides a robust mechanism for parameterizing expressions passed to the `i`, `j`, and `by` (or `keyby`) arguments of `[.data.table`. It is built upon the base R `substitute` function, and mimics its interface. Here, we introduce `substitute2` as a more robust and more user-friendly version of base R's `substitute`. For a complete list of differences between `base::substitute` and `data.table::substitute2` please read the [`substitute2` manual](https://rdatatable.gitlab.io/data.table/library/data.table/html/substitute2.html).
Starting from version 1.14.2, data.table provides a robust mechanism for parameterizing expressions passed to the `i`, `j`, and `by` (or `keyby`) arguments of `[.data.table`. It is built upon the base R `substitute` function, and mimics its interface. Here, we introduce `substitute2` as a more robust and more user-friendly version of base R's `substitute`. For a complete list of differences between `base::substitute` and `data.table::substitute2` please read the [`substitute2` manual](https://rdatatable.gitlab.io/data.table/library/data.table/html/substitute2.html).

### Substituting variables and names

Expand Down