Understanding Long-Format Data and the Need for Reshaping Using Pivot_Wider in R Programming Language

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

Reshaping Data from Wide Format to Long Format Using Tidyr's pivot_longer Function

Reshaping Pandas DataFrames with Multiple Columns Using Stack and Unstack

Understanding the Issue with Subsetting R Data Frame Results in Mysterious NA Rows

Stacking Columns by Looking at the First Column Using Pandas' lreshape Function in Python