In this blog post I introduce three small RStudio addins I did. ‘bracketify’ I prefer subsetting with the double brackets than with the dollar in R, because this is more readable in RS... [Read more...]

In a recent post I explained how to decorate a surface with moving colors with the Python library PyVista. Here I expose this method for the R package rgl. I will take a Hopf... [Read more...]

The gifski command-line utility is a great tool to make a GIF animation from a series of png files. At my work I’m using a laptop with Windows 10 and I don’t have admin rights. I don’t know how to install... [Read more...]

Four years ago I wrapped the C library Qhull in a Haskell package. Thanks to Qhull, this package can do some convex hulls and some Delaunay tessellations. The Qhull library also allows to do some ... [Read more...]

Eric Dunipace recently released a new package on CRAN: RcppCGAL. It allows to link to the C++ library CGAL in Rcpp. The CGAL library provides an extensive set of algorithms for computational geome... [Read more...]

We will firstly show how to clip an isosurface to a ball with R, and then, more generally, how to clip a surface to an arbitrary region. In the last part we show how to achieve the same with Python. ... [Read more...]

I do not well remember, but it seems to me I faced some difficulties when I tried to use Shiny bookmarking to save and restore the state of a Shiny app. These difficulties arose when there were some rende... [Read more...]

My new package ‘gfiExtremes’ is on CRAN now. So it is time to present it. This package allows to get confidence intervals about the quantiles of any reasonable distribution (although... [Read more...]

Throughout this article, one considers the balanced one-way ANOVA model with a random factor (group). The between standard deviation and the within standard deviation are denoted by \(\sigma_{\mathrm{b}}\... [Read more...]

Updated title: Haskell is fast, but Julia is faster (see updates at the end). My R package ‘HypergeoMat’ provides a Rcpp implementation of Koev & Edelman’s algorithm for the eval... [Read more...]

It seems to me that the kde1d package (One-Dimensional Kernel Density Estimation) is not very known. I’ve never heard of it on Stack Overflow, except in an answer of mine. However this is a ... [Read more...]

These are some of my artworks realized with the R package rgl. Source code is available in my gists. ... [Read more...]

I’m going to show how to use the DT package to do a table with child tables, and how to edit and export such a table. In order to do a table with child tables, one adds a list column to the ... [Read more...]

This blog post provides some R code for drawing focal quadrics and their curvatures lines with the rgl package. Ellipsoid The ellipsoidMesh function below generates a mesh of the ellip... [Read more...]

Let \(s \colon I \times J \times K \to \mathbb{R}^4\) be a parameterization of a hypersurface \(\mathcal{S}\), where \(I,J,K \subset \mathbb{R}\) are some intervals. I’m going to show how ... [Read more...]

In a previous post, I explained how to get a parameterization of a Hopf cylinder or torus. There is a clearer way, which I present here. For the Hopf map, the preimage of a point \(p... [Read more...]

I came across this interesting paper entitled Complex Variables Visualized and written by Thomas Ponweiser. In particular, I was intrigued by the generalized powers of a Möbi... [Read more...]

In this post, I show how to use the qTip2 JavaScript library to create some tooltips on the headers of a DT datatable in Shiny, displaying some information about the columns, such as summary stati... [Read more...]

In this post, I’ll show how to draw a stereographic duoprism using R, Asymptote and POV-Ray. With R library(rgl) A [Read more...]

The stereographic truncated tesseract Drawing with rgl (R) Drawing with Asymptote Drawing with POV-Ray The stereographic truncated tesseract ... [Read more...]