CJR questions

CJR answers

• Code block unreachable when in if/else statement
• Why does one use of iloc() give a SettingWithCopyWarning, but the other doesn't?
• Pandas style: How to highlight diagonal elements
• Create a pandas column based on a lookup value from another dataframe
• Why is R row extraction slower on large sparse Matrix than when dividing it into smaller pieces and then extracting?
• Scipy sparse matrix – element-wise multiplication and division of only non-zero elements
• Counting Number of Occurrences Between Dates (Given an ID value) From Another Dataframe
• Code works, but not when inserted inside of a method