Search
-
Recent Posts
- VBA Corruption Registry Fix
- Sheet Calculate Change
- Python in Excel: Python User Defined Functions
- Python in Excel: Controlling Python Calculation
- Python in Excel: How do Excel and Python Formulas Work Together?
- Python in Excel: PY Calculation, Globals & Co-Volatility
- Python in Excel: Round-Tripping Gotchas
- Manual Calculation No Longer Viral!
- Only Calculating the Active Workbook
- Excel Screen-updating Performance Comparison.
Recent Comments
Jim on VBA Corruption Registry F… fastexcel on VBA Corruption Registry F… Jean-Michel DITNER on VBA Corruption Registry F… Sandeep Kothari on Short-circuiting Excel Formula… Sandeep Kothari on Short-circuiting Excel Formula… Veit Stimpfl on Excel Memory Checking Tool: Us… fastexcel on Short-circuiting in Array… Sergei on Short-circuiting in Array… Post Archive
- February 2024 (2)
- November 2023 (4)
- October 2023 (1)
- March 2023 (2)
- January 2023 (3)
- October 2020 (1)
- July 2020 (1)
- February 2020 (1)
- May 2019 (2)
- January 2019 (1)
- July 2018 (2)
- January 2018 (1)
- September 2017 (1)
- April 2017 (2)
- March 2017 (4)
- February 2017 (1)
- December 2016 (1)
- November 2016 (3)
- October 2016 (2)
- July 2016 (1)
- April 2016 (1)
- February 2016 (1)
- December 2015 (4)
- November 2015 (2)
- September 2015 (2)
- May 2015 (2)
- February 2015 (1)
- January 2015 (2)
- December 2014 (1)
- November 2014 (2)
- October 2014 (3)
- September 2014 (2)
- August 2014 (2)
- June 2014 (1)
- April 2014 (1)
- February 2014 (1)
- January 2014 (3)
- December 2013 (2)
- November 2013 (4)
- October 2013 (6)
- September 2013 (4)
- February 2013 (3)
- January 2013 (3)
- December 2012 (4)
- November 2012 (2)
- October 2012 (2)
- September 2012 (1)
- July 2012 (6)
- June 2012 (7)
- April 2012 (1)
- March 2012 (2)
- February 2012 (1)
- January 2012 (3)
- December 2011 (1)
- November 2011 (3)
- October 2011 (2)
- September 2011 (2)
- August 2011 (1)
- July 2011 (4)
- June 2011 (8)
- May 2011 (4)
Categories
Blogroll
RSS
Blog Stats
- 1,327,422 hits
- Follow Excel and UDF Performance Stuff on WordPress.com
Category Archives: Excel
Python in Excel: Python User Defined Functions
This post explores using Python in Excel to create Python User Defined Functions. The example used is a function to calculate Gini coefficients (see https://fastexcel.wordpress.com/2011/05/21/fast-gini/). Defining the UDF Python UDFs live in the workbook global Python space and must be … Continue reading
Posted in Calculation, Excel, Python, UDF
Tagged calculation speed, Excel, Python, UDF
Leave a comment
Python in Excel: Controlling Python Calculation
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 calculation methods, calculation speed, Excel, Python
Leave a comment
Python in Excel: How do Excel and Python Formulas Work Together?
In the previous post I showed how Python and Excel calculation methods are completely different: So when Excel formulas and Python formulas depend on one another how does this all work? Excel->Python->Excel->Python Lets look at a simple example of inter-dependent … Continue reading
Python in Excel: PY Calculation, Globals & Co-Volatility
Python Calculation Python in Excel calculates all the PY cells in a workbook sheet by sheet, and row by row, starting at the top left PY cell. If you break this calculation sequence rule, by for instance moving cell E5 … Continue reading
Only Calculating the Active Workbook
When you have more than one workbook open Excel has always recalculated all of the workbooks at each recalculation. That can be very painful if one or more of the workbooks are slow to calculate. Now the Excel Dev Team … Continue reading
Short-circuiting in Array Formulas
The previous post demonstrated that IF and CHOOSE short-circuit but IFS and SWITCH do not. But following up a hint from Bill Wu that IF behaves differently in array formulas I decided to check whether it still short-circuits.(IF in array … Continue reading
Short-circuiting Excel Formulas: IF, CHOOSE, IFS and SWITCH
What is formula short-circuiting? Short-circuiting occurs in Excel formulas when an IF statement only evaluates the True part of the IF and skips the False part of the IF. For example in this formula: Because 1>2 evaluates to False the … Continue reading
FastExcel Version 4 – with Introductory Offer
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)
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
Develop Excel Conference
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
Excel and UDF Performance Stuff 