Combining Rows in Pandas: Grouping and Aggregation Techniques

Customizing Push View Controller Transitions with QuartzCore Animations and UIStoryboardSegue Subclassing in iOS Navigation Controllers

Understanding Package-Dependent Objects in R: Saving and Loading Data Structures with R Packages

Understanding T-SQL DateTime Conversion Behavior: The Hidden Precision Costs

Creating Array Structures from Dataframes in R: A Step-by-Step Guide

Understanding UISlider Events in iOS for Smooth Label Updates

Using Oracle's match_recognize to Solve Overlapping Purchases

Generating the Same Random Sample Each Time in a Loop Using Sample_frac

Creating Percentage Stacked Area Charts with Matplotlib and Pandas

Integrating Twitter OAuth into Your iPhone Application: A Step-by-Step Guide