Here's a summary of the provided information and some additional examples to demonstrate the usage of the `melt()` function in R:

How to Create New Columns Based on Start End Years in R Data Frames Using Basic Addition and Subtraction or dcast Function

Reshaping Long-Form Data with Pandas: A Comparison of Two Methods

Reshaping Data in R with Time Values in Column Names: A Comprehensive Guide

Converting Pandas DataFrames from Long to Wide Format Using Multi-Index Composite Keys

Reshaping Three-Collar Data Frames to Matrix Format Using R

Reshape and Expand Dataframe in R: A Step-by-Step Guide