Expanding a Dataset by Two Variables Using Tidyr's expand Function

Replacing Values in Binary Matrices with Dataframe Values Using Tidyverse in R: A Step-by-Step Guide

Overcoming the Limitations of sapply: A Guide to Efficient Vectorized Operations in R

Leave-One-Out Cross Validation in R with Vegan Package: A Comprehensive Guide

Iterating Over Sparse Row Vectors in Armadillo

Converting PDF Files to Plain Text Using System() in R

Here is a complete code snippet that combines all the interleaved code you wrote in a nice executable codeblock:

Understanding the Behavior of `<<-` and `assign` in `lapply` Loops: A Guide to Avoiding Unexpected Assignments

Understanding the Issue with Missing Rows When Using read.table() in R

Understanding Marginal Taxes and Interdependent Variables in R: A Practical Guide to Calculating Tax Liabilities and Rates Using Algebra and Numerical Methods with R.