Blog

2023-08-21 Restart in less than an hour

It’s been over a year since I last published an update to this blog and six months since I’ve loaded up the project.
Aug 21, 2023
Charlie Hadley

How I learned to stop replicating everything from {xaringan} and love Quarto

Since the end of the rstudio::conf(2022) I’ve been working on replicating the {xaringan} RMarkdown presentation format in {quarto}. If you’ve never seen these slides before, here’s the self-documenting template from Yihui Xie (click inside the slides and use your arrow keys).
Aug 4, 2022
Charlie Hadley

Creating an R-Ladies quarto format

It’s the day after rstudio::conf(2022), and like many folks in the audience I’m very excited about the future of {quarto}. (LINKS). To help me better understand the differences between RMarkdown and quarto I decided I’d convert Alison Hill’s R-Ladies {xaringan} theme into a quarto format
Jun 20, 2022
Charlie Hadley

Overriding individual code chunk options

I’ve just moved this entire blog from {blogdown} to {quarto}. It was mostly simple but for one of the blogposts I really wanted a way to override individual code chunk options. Let’s make a toy .Rmd document to demonstrate this:
Jun 20, 2022
Charlie Hadley

Writing verbatim SQL in pipe chains using {dbplyr}

I’ve been trying to use the {dbplyr} package when working with SQL and R. It provides a really nice interface for writing tidyverse code against a database connection. I feel that {dbplyr} gives a generally nice interface than using {DBI} which is the approach used in db.rstudio.com, but it’s under documented.
Jun 15, 2022
Charlie Hadley

Shiny modules to reduce duplication in apps

shiny

Help reduce the duplication of code in {shiny} apps through the use of modules
Jul 9, 2019
Charlie Hadley

Shiny modules for useful controls

shiny

If you need to re-use combinations of controls in {shiny} apps (or across multiple app) then modules can help!
Mar 25, 2019
Charlie Hadley

One weird regex matches 97% of DOI…

reproducible research

This one weird regex matches 97% of DOI…
Mar 13, 2019
Charlie Hadley

Where is the centre of University of Oxford?

dataviz
GIS

University of Oxford has over 800 years of history to it, but if you want to organise a meeting at the centre of campus… where do you meet?
Feb 18, 2019
Charlie Hadley

Keeping secrets in blogdown

Keeping API keys and passwords secret in a blogdown blog using the static/ folder and the secret package.
Jan 2, 2019
Charlie Hadley

Using ggmap after July 2018

dataviz
R
ggmap is an awesome package for creating maps with ggplot2. If you’ve seen a nice looking map built with ggplot2 I can almost guarantee you that it uses ggmap to look that good. The ggmap package is used to obtain base maps from the APIs of a number of online mapping tools, the one we care about here is the base maps from Google Maps (because they’re very good).
Dec 5, 2018
Charlie Hadley, Charlie Joey Hadley

Christmas Drinks ggplot2 Advent Calendar 2018

dataviz

There are just about 24 Christmassy hot drinks available in the big UK cafes. I’ve made an advent calendae of them in ggplot2, read this post to find out how to do the same.
Nov 28, 2018
Charlie Hadley

Crawling DOI from a SAGE

Recently a friend told me they were doing a systematic review of the Hand Therapy Journal published by SAGE. They wanted a way to scrape the journal for all publications - without going mad in the process. It seemed like a good excuse to get them motivated to learn R and for me to practice web scraping with the rvest package.
Nov 12, 2018
Charlie Hadley

Great circles with sf and leaflet

GIS

Great circles are the shortest journeys between two points on a map, which can be easily computed and manipulated through the use of the excellent sf library, and visualised interactively with leaflet.
Feb 28, 2018
Charlie Hadley

Crawling with tidygraph

In this blogpost I use crawling the internal links between pages in the University of Oxford’s Research Data website as an excuse for finally getting to grips with tidygraph and ggraph
Feb 27, 2018
Charlie Hadley

Recipes for learning

dataviz

In this blogpost I introduce one of my favourite datasets, a treasure trove of 57,000+ recipes scraped from recipe websites for a fascinating research paper (DOI: 10.1038/srep00196) comparing how different cuisines choose ingredients. I first used this dataset in May 2015 to learn how to use R and continue to use it to test my understanding of new techniques and analysis.

Feb 18, 2018
Charlie Hadley

Where’s the love for htmlwidgets?

dataviz

If you’ve never heard of them, htmlwidgets are an amazing part of the work that RStudio (plus ramnathv and timelyportfolio) have undertaken to make R a beautiful tool for doing data science and communicating things about your data. Using leaflet, plotly, highcharter and more it’s possible to create rich interactive charts, maps and other visualisations directly from R without having to learn JavaScript
Feb 7, 2018
Charlie Hadley
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