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

Using the Apply Function to Calculate Distance Between Two Matrices

Calculating Temporal and Spatial Gradients while Using Groupby in Multi-Index Pandas DataFrame: A Step-by-Step Guide to Efficient Gradient Computation

Defined Functions with For Loops in Python: Efficient Data Manipulation Using Pandas

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

Understanding the Limitations of the Pandas Apply() Method: Why Vectorized Operations Are Faster