Introduction lapply is a fundemental programming function in R, used to apply a function over a list ot a vector. Running lapply in a nested manner leads to a nested outcome. For example, the following code: 1lapply(c("A", "B"), function(x) { 2 lapply(c("C", "D"), function(y) { 3 …

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This is a short tutorial on building a plotly stripchart with a dropdown to select a dataset. It covers a few points such as how to handle stripcharts with jitter in plotly, building the plotly menu programatically and how to format a dataset to work with plotly dropdowns. Of course, the same effect can be accomplished …

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This is a simple example of resizing {bslib} cards for a dashboard. A card can be made resizable (vertical, horizontal or both) by using the resize property. In order to use this in a {bslib} dashboard it can be added using tags$style or included in bs_theme(). Adding the resize-vertical class adds a resize anchor to …

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R has several object-oriented systems and I'm a big fan of R6. Detailed below is a specific use-case. I wanted a parent class that held a list of child classes with thet specification that the child class instances could update the parent class instance. Parent Class The parent class is shown below along with a table …

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Plotly charts can be enhanced with custom controls. One use of controls is to update an existing chart. This post will show how to add a couple of buttons to a chart, toggling error bars on and off. It should be noted that coloring by group affects the order (and hence validity) of error bars in a Plotly plot so a …

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Quarto has many improvements over RMarkdown, plus a couple of limitations, one being that you cannot pass R objects as parameters to a Quarto document in the way the RMarkdown would accept them. Quarto receives parameters serialized as yaml, so only text, numeric, boolean (received as TRUE="yes" and …

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Building my First Quarto Shortcode Extension Quarto is a scientific publishing system used to build documents, presentations, books and websites. Quarto extensions are a powerful way to extend the behavior of Quarto. These extensions are built using Lua, a language that I do not have much familiarity with but, building …

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The {sortable} package {sortable} is an incredibly useful R package built upon the sortbale.js javascript library, allowing drag-and-drop features to be incorporated into shiny apps. The package works with two types of sortable lists: rank list: items can be sorted within a list bucket list: a single object containing …

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Serverless Shiny Inspired by Max Kuhn's presentation at R/Pharma today I tried out embedding shiny a app within a Quarto website and hosting it on GitHub pages. The app itself is a chemistry quiz built to help my son who had a school test coming up. By running it within a Quarto website it's available for him to use on …

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Shiny textInput label This is just a short post highlighing how you can move a textInput label so that it is within the textbox textInput box itself. This is a style that can be used when you have multiple textInputs and wish to preserve screen height. First we define a css class to reduce the size of the label text …

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