How to Create a New Column Using Custom Function in Pandas Without Encountering Common Errors

Applying Vectorized Operations with Apply-like Functions in R to Speed Up ODE-Solver Computations

Optimizing Pandas DataFrame Apply for Large Data: A Guide to Speeding Up Computations

Calculating Mean (or Other Function) per Column for Subsets of a Matrix Based on Another Matrix in R

Calculating Proportion of Money Spent from Last Day in Rolling Window Periods with Pandas

Applying Functions to Multiple DataFrames and Columns in Python with Pandas.