R is a very powerful language but was designed to run single-threaded. There are libraries that will run parallel code but there is no inherent support to run a background process and monitor for completion in the same way that you can in, for example, C++. One way to overcome this is to launch a second instance of R …

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queryBuilder is an htmlwidget wrapper for jQuery queryBuilder, a fantastic jQuery plugin to create queries and filters. The htmlwidget generates a dplyr string that can be used to filter a data frame within a shiny app. In addition I'm playing with some experimental features to expand functionality. The first is a way …

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I’m starting to experiment with RStudio Connect. I’ve been working on a shiny app that writes to a database and a flexdashboard that can illustrate the output. When writing this type of approach using Shiny Server, both pieces of code could simply point to the same sqlite database. This becomes a little more …

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There seems to be a fad right now of merchandising articles containing words made up of chemical symbols. Beryllium Erbium (BeEr) is particularly popular and I have to admit I have a T-Shirt claiming "Call me NErDy". I've put together a small code in R which will check to see if a word can be created purely …

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There are times when we need to perform ANOVA calculations on multiple sets of features in order to generate a list of p-values. A traditional approach is to use the base function aov and extract the p-value from it. This can be slow when analyzing thousands of features. An alternative is to use the multtest library …

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Here’s an example of how to embed subtables in a datatable. It’s an enhancement of the child rows example found at https://rstudio.github.io/DT/002-rowdetails.html and works by storing JSON versions of subtables as a column in the main table dataframe. The current release of the DT library converts the JSON format into …

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About 2 years ago my beloved Asus G60VX died. I loved that laptop. We'd been through a lot together and enjoyed five wonderful years. After a brief mourn I had a long think about the future and decided to move to a Chromebook. Precisely an Acer C270. I've moved from 15"x10" (16" screen), 7.3lbs to …

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A common task when working with data is split-apply-combine – splitting a dataset up, applying a function and then recombining the results. It’s often performed in creating summary tables around a factor. First let’s define the data to be used. I'm interested in a scenario where I have nS samples at nC concentrations …

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There are many fantasy sports out there. Since I'm from England I like playing fantasy football (that's football, also known as soccer where I am now). Rules are pretty straight forward - pick a team of players from the Premier League and score points depending on how they perform. Most British leagues work on the …

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There are several ways that users can be managed in Shiny apps but they all require access to the config file. User access can be managed within the app itself using a database to hold user information. Two examples are given below: The first utilizes a simple database in which the passwords are not encrypted (not …

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