Category Archives: Calculation

Formula Explorer Pro Beta 4.2

After another 6 months on my quest to create the worlds best tool for exploring, validating, debugging and editing Excel formulas I have made Explorer Pro Beta 4.2 build 418.796 available. Hopefully this will be the final Beta! The improvements … Continue reading

Posted in Calculation, Debug formulas | Tagged , , , | 6 Comments

Excel JavaScript API Part 2: Benchmark of Read/Write Range Performance

As an Excel Office Developer many of the Excel based applications I develop depend on reading data from Excel worksheet ranges, processing it and then writing the processed data back to a worksheet. In VBA the way to do this … Continue reading

Posted in arrays, Calculation, JS-API, VBA | Tagged , , | 3 Comments

Why Structured References are slow in Excel 2013 but fast in Excel 2016

Tables have a bad reputation for performance. Zack (Firefytr) Barresse (who wrote the definitive guide to Excel Tables with Kevin (Zorvek) Jones) recommends a limit of around 10K rows for tables if you want to keep performance reasonable. Prompted by … Continue reading

Posted in Calculation | Tagged , , , , , | 5 Comments

Excel Versions Screen Test (Updated): how fast is Screen Updating?

Gurs has an interesting benchmark he has been running on various systems and Excel versions over the years. His results seem to show a massive performance decline in later Excel versions. Looking at his benchmark and its VBA code you … Continue reading

Posted in Calculation, Formatting, Uncategorized, VBA | 9 Comments

Writing Efficient VBA UDFs Part 14: Handling whole columns using Implicit Intersection – Updated

Excel has an interesting and very efficient trick called Implicit Intersection which allows you to use large Named Ranges and whole column references efficiently. What is Implicit Intersection? When Excel expects to get a single cell reference but you give … Continue reading

Posted in arrays, Calculation, UDF, VBA, XLL | Tagged , , , , | 15 Comments

Excel What-If Data Tables: Faster calculation with VBA

For some reason this year I keep on meeting Excel’s What-If Data Tables. These are used (often in real estate and financial valuation models) to simplify doing sensitivity analysis against a range of values for certain inputs such as interest … Continue reading

Posted in arrays, Calculation, VBA | 5 Comments

Excel Full Column References and Used Range: Good Idea or Bad Idea?

Some people love using full column references such as A:A, other people say they slow down your workbook to a crawl and lead to workbook and memory bloat. The attraction of using whole column references is that you don’t have … Continue reading

Posted in arrays, Calculation, Formatting, Memory | 5 Comments

Timing Calculation Consistently: Windows Update/Background Process Woes

Last Friday¬† 4 December 2015 I was presenting a session at the Modeloff Global Training Camp in London. The session was “How to make your Excel workbooks calculate faster”, and so it involved demonstrations of timing formula calculation. No problem … Continue reading

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Excel User Voice and Workbook Calculate

Excel User Voice At the recent Excel Global Summit the Excel team were keen to explain how they have started using Excel User Voice to ask for and prioritise product improvement suggestions. https://excel.uservoice.com/ There are 2 important things to note … Continue reading

Posted in Calculation | Tagged , , | 4 Comments

Writing Efficient VBA UDFs (Part13): MaxMinFair Resource Allocation – an array UDF example

Last year we got to spend a great day at Microsoft Research in Cambridge (UK). one presentation was about storage strategies and featured (amongst other stuff) an interesting algorithm called MaxMinFair. The MaxMinFair algorithm You can read about it here … Continue reading

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