Using Custom Aggregate Functions with cast() in R reshape2: A Practical Guide to Resolving the Limitation of vapply and fill=0

Reshaping DataFrames from Wide to Long Format in R: A Comparison of Two Approaches Using data.table and tidyr

Pivot Pandas DataFrame Column Values for Data Reformatting

Understanding Overlapped Values in R: A Graph-Based Approach

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