Category Archives: VBA

Python in Excel: Controlling Python Calculation

Posted on November 2, 2023 by fastexcel

Because Python calculations can be slow it is worth looking at ways of controlling Python calculation. Partial Calculation The calculation setting that used to be called “Automatic except Data Tables” has been renamed to “Partial”. Partial Calculation works like Automatic … Continue reading →

Posted in Calculation, Excel, Python, VBA | Tagged , , , | Leave a comment

FastExcel Version 4 – with Introductory Offer

Posted on February 5, 2020 by fastexcel

After several man-years of development and a lot of beta testing FastExcel Version 4 has finally hit general availability! FastExcel V4 is a major rewrite of FastExcel V3 and provides many of the things you have been asking for: Support … Continue reading →

Posted in arrays, Calculation, Debug formulas, Dynamic Arrays, Excel, Lookups, Memory, UDF, VBA | Leave a comment

Backward Compatibility of Office 365 Dynamic Arrays (Updated 23 Sep 2020)

Posted on May 20, 2019 by fastexcel

Office 365 Excel Dynamic Arrays are great, but: What happens when you create a workbook with Dynamic Array  Excel (Excel DA) and send it to someone who does not have Excel DA, and how do you write VBA code that … Continue reading →

Posted in arrays, Dynamic Arrays, Excel, Uncategorized, VBA | Tagged | 21 Comments

Develop Excel Conference

Posted on July 30, 2018 by fastexcel

The Develop Excel conference will take place in London on Thursday October the 18th 2018. It will be held at the Microsoft Reactor (70 Wilson Street London EC2A 2DB). Are you responsible for building Excel based Addins and Solutions? Develop … Continue reading →

Posted in .NET, arrays, Excel, JS-API, UDF, VBA, XLL | 2 Comments

Strategies for getting the last row in Excel with VBA

Posted on September 1, 2017 by fastexcel

Using VBA to get the last row in Excel can be a surprisingly complex task. This post will explore some of the different strategies you can use. The first thing to do is to decide what you mean by “The … Continue reading →

Posted in Excel, Formatting, VBA | Tagged , | 10 Comments

Excel JavaScript API Part 3: Benchmark of Processing Arrays Performance – Loop vs Reduce vs COUNTIFS vs VBA

Posted on March 16, 2017 by fastexcel

In a previous post I compared several different ways of processing data with VBA. The fastest way was to get the data into a variant array and loop on it. JavaScript has some powerful array methods so I wanted to … Continue reading →

Posted in arrays, JS-API, VBA | Tagged , , | 5 Comments

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

Posted on March 13, 2017 by fastexcel

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

Excel Range.Value(ValueType): What is this parameter?

Posted on March 13, 2017 by fastexcel

Whilst visiting Microsoft Research in Cambridge I was chatting to fellow MVP Roger Govier. He mentioned that he was using this strange parameter to the Range.Value (ValueType) method, which I had been meaning to look at for a long time … Continue reading →

Posted in Formatting, VBA | Tagged , | 10 Comments

Excel JavaScript API Part 1: Overview & Comparison

Posted on March 13, 2017 by fastexcel

I have been spending time in the last few months experimenting with the new JavaScript Excel API. This is the first of a planned series of posts examining the JS-API from the point of view of an Excel Office developer. … Continue reading →

Posted in .NET, JS-API, UDF, Uncategorized, VBA, XLL | Tagged , , , , | 10 Comments

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

Posted on December 14, 2016 by fastexcel

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