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Category Archives: Calculation
Stacking (Appending) Arrays/Ranges in Excel: Formulas versus Functions Shootout
This post is a follow up to my last post Using Constant Arrays and Expressions in Excel Formulas. I will explore how some of the general purpose array-handling functions in FastExcel SpeedTools Extras compare with formulas using native Excel functions. … Continue reading
Posted in arrays, Calculation, Lookups, Uncategorized, XLL
Tagged array constant, array expression, array function, Arrays, calculation speed, Excel Formulas, Excel functions, XLL
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Calling XLAM/XLL/Automation UDFs from VBA: Evaluate, Run, or Reference?
I have this nagging feeling that I do not know the best way to call UDFs from VBA. So after a couple of days of research here is what I have found out so far. The Available Methods Application.ExecuteExcel4Macro This … Continue reading
Posted in Calculation, UDF, VBA, XLL
Tagged array formula, array function, calculation speed, UDF, XLL
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Timing the Ins and Outs of User Defined Functions: Multi-Cell array formulas can be slow
I was looking at some multi-cell array formula UDFs with John and Rich and could not understand why they seemed so much slower than I expected. Each UDF (written as C++ XLLs) read data from around 200 cells using around … Continue reading
Posted in Calculation, UDF, Uncategorized, VBA, XLL
Tagged array formula, array function, calculation speed, Excel 2010 Calculation Bug, UDF, XLL
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Getting Used Range in an XLL UDF: Multi-threading and COM
In two previous blog posts I discussed why handling whole-column references efficiently in VBA UDFs meant that you had to find the used range for the worksheet containing the whole-column reference. The posts also discussed how using a cache for … Continue reading
FastExcel V3 Released with Introductory Offer
FastExcel has been used successfully by thousands of users since it was first launched in 2001. The last version 2.4 was introduced in 2008 and since that time there have been major changes to Excel with Excel 2007, 2010 and 2013, … Continue reading
Posted in Calculation, Lookups, Memory, UDF, VBA, XLL
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Threading and Hyper-Threading: Optimizing Excel Calculation speed by changing the number of threads
I have just implemented measuring multi-threaded calculation efficiency in FastExcel V3 Profile Workbook: so I thought it would be interesting to see the effect on calculation speed of varying the number of threads, and switching off hyper-threading. Hyperthreading Almost all … Continue reading
Excel 2013 SDI Bug: “Calculate” in Status Bar strikes again
In the old days (I’m talking Excel 5 to Excel 2003 here) there was a worrying situation you could find yourself in where, no matter what you did, Excel would show you “Calculate” in the statusbar. Even when actually nothing … Continue reading
Posted in Calculation, VBA
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Finding out if a function is Volatile or Multithreaded using VBA: UDFs for UDFs
Part of my new Profiling Formulas and Functions command requires the code to determine whether a Function is a native built-in Excel function, or an XLL function, or some other kind (VBA, Automation). And I also want to know if … Continue reading
Posted in Calculation, UDF, VBA, XLL
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Formula References between Sheets versus within Sheets shootout: Which calculates faster and uses more Memory
I thought I would revisit the differences between formulas that reference other worksheets and formulas that only reference their own worksheet. Referencing other worksheets always used to be a memory hog, but so much has changed between Excel 2003 and … Continue reading
