https://www.rostrum.blog/tags/purrr/ Recent content in Purrr on rostrum.blog Hugo -- gohugo.io en-gb Sat, 27 Feb 2021 00:00:00 +0000 https://www.rostrum.blog/2021/02/27/typos/ Sat, 27 Feb 2021 00:00:00 +0000 https://www.rostrum.blog/2021/02/27/typos/ The author at work (CC BY-SA 3.0 KaterBegemot) tl;dr Nearly 10 per cent of the commits to this blog’s source involve typo fixes, according to a function I wrote to search commit messages via the {gh} package. Not my typo I’m sure you’ve seen consecutive Git commits from jaded developers like ‘fix problem’, ‘actually fix problem?’, ‘the fix broke something else’, ‘burn it all down’. Sometimes a few swear words will be thrown in for good measure (look no further than ‘Developers Swearing’ on Twitter). https://www.rostrum.blog/2020/06/14/ghdump/ Sun, 14 Jun 2020 00:00:00 +0000 https://www.rostrum.blog/2020/06/14/ghdump/ My garbage GitHub repos being dumped onto my local machine (via openclipart.org, CC0 1.0) tl;dr Run ghd_copy() from the {ghdump} package to either clone or download all the GitHub repositories for a given user. Intended for archival purposes or setting up a new computer. The package comes with no guarantees and will likely be in a perpetual work-in-progress state. Please submit issues or pull requests. Clone army Situation: https://www.rostrum.blog/2020/03/12/knit-with-params/ Thu, 12 Mar 2020 00:00:00 +0000 https://www.rostrum.blog/2020/03/12/knit-with-params/ Driving a Wedge (via Giphy) tl;dr You want to use R to generate multiple reports from a single template, each containing different data. How? Create a parameterised RMarkdown template with a params YAML argument. Iterate over param values with rmarkdown::render() inside purrr::map(). I made a demo of this approach that focuses on parameterised {xaringan} slides. It includes a further {purrr} step with pagedown::chrome_print() to render the HTML outputs to PDF. https://www.rostrum.blog/2019/12/27/pkgs-2019/ Fri, 27 Dec 2019 00:00:00 +0000 https://www.rostrum.blog/2019/12/27/pkgs-2019/ Marie Kondo (Netflix via Giphy) Thank you package-makers I’ve used a lot of packages in 2019 and many have brought great joy to my R experience. Thank you to everyone who has created, maintained or contributed to a package this year. Some particular packages of note for me have been: 🤖 {usethis} by Hadley Wickham and Jenny Bryan 🦆 {drake} by Will Landau 🐈 {purrr} by Lionel Henry and Hadley Wickham And some honourable mentions are: https://www.rostrum.blog/2019/12/08/altcheckr/ Sun, 08 Dec 2019 00:00:00 +0000 https://www.rostrum.blog/2019/12/08/altcheckr/ tl;dr I’ve made a small R package called {altcheckr} that checks the accessibility of images on web pages. It has functions that (1) scrape attributes from HTML elements on a web page and (2) apply simple rules to indicate the suitability of the alt text provided. To use: remotes::install_github("matt-dray/altcheckr") images <- alt_get("https://www.bbc.co.uk/news") alt_check(images) I’m not an expert and the package has not been user tested. Accessibility A web site is accessible if everyone can engage with its content. https://www.rostrum.blog/2019/02/14/relayverse/ Thu, 14 Feb 2019 00:00:00 +0000 https://www.rostrum.blog/2019/02/14/relayverse/ The Relay FM podcast network, visualised. View it here. tl;dr I made an interactive graph network of the podcast host relationships on Relay FM using R. You can interact with it in a separate window and find out below how it was made. I refreshed the data and style of the visualisation on 02 Jan 2020. Podcast networks Podcasting is becoming big business. Music-streaming giant Spotify just acquired the podcast network Gimlet for a reported $200 million. https://www.rostrum.blog/2018/06/05/tid-ye-text/ Tue, 05 Jun 2018 00:00:00 +0000 https://www.rostrum.blog/2018/06/05/tid-ye-text/ Matt Dray ⚠️ Warning: this post contains offensive words. ⚠️ Genius? Kanye West released his latest album – ye – last week1 after a(nother) pretty turbulent and controversial period of his life2. So what’s been on his mind? I think the real question is why don’t we scrape Yeezus’s lyrics from the web and analyse them using R? Obviously. Genius Genius is a website where you can upload and comment on song lyrics. https://www.rostrum.blog/2018/04/14/r-trek-exploring-stardates/ Sat, 14 Apr 2018 00:00:00 +0000 https://www.rostrum.blog/2018/04/14/r-trek-exploring-stardates/ Captain’s log Star date 71750.51. Our mission is to use R statistical software to extract star dates mentioned in the captain’s log from the scripts of Star Trek: The Next Generation and observe their progression over the course of the show’s seven seasons. There appears to be some mismatch in the frequency of digits after the decimal point – could this indicate poor ability to choose random numbers?