Learn how to sum data in Excel using IF conditions with SUMIF or SUMIFS. Perfect for accurate reporting and data analysis.

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...

Abstract: A combined cryptosystem with symmetric keys for encrypting messages is proposed. Its unique feature is the use of functions of a real variable as keys instead of natural numbers. Eight key ...

answer Here is the implementation of the `drop_empty` function: ```python def drop_empty (dict1): return {k: v for k, v in dict1.items () if v is not None} ``` This function uses a dictionary ...

While we have the Python built-in function sum() which sums the elements of a sequence (provided the elements of the sequence are all of numeric type), it’s instructive to see how we can do this in a ...

Have you ever struggled with Excel formulas, trying to calculate running totals only to be left with errors and frustration? Many of us have faced the challenge of managing datasets where each row’s ...