Here's a more detailed explanation of how to implement rate limiting and caching for the Google Maps Distance Matrix API:

RcppArmadillo Header Files: A Comprehensive Guide to Enhancing Code Organization and Maintainability in R Packages

How to Add Hidden Layers to Your Neural Network Using the Deepnet Package in R

Creating Efficient Shiny Apps with Embedded Datasets: Workarounds for the 'Dataset Out of Scope' Issue.