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Monthly Archives: October 2014
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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Automatic or Manual Calculation?: Grouped Sheets causes Calculation Confusion.
Thanks to Simon Hurst and Paul Wakefield for telling me about this calculation weirdo, and credit to Chatman at Accounting Web for discovering it. Grouped Sheets and Calculation Mode Try these experiments: Experiment 1 Start Excel Open a workbook in … Continue reading
Posted in Uncategorized
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Excel 2007 multi-threading bug with Range.SubTotal and XLL
OK: this is a fairly obscure Excel 2007 only bug but I thought I should place it on record. The conditions required for the bug are: Excel 2007 (tested with 12.0.6683.5002 SP3) Automatic calculation Mode Multi-threaded calculation is on and … Continue reading
Posted in Uncategorized
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