Here's the complete code with all methods:

Converting Rows to Columns in R: A Step-by-Step Guide with reshape2 and tidyr Packages

Advanced Grouping and Reshaping Transformation Using Pandas

Finding Consensus in Two Out of Three Columns and Summarizing Them with R Code

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

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

Pivoting Varnames with Regular Expressions in `pivot_longer`

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