Category Archives: Excel

More powers of 3

Posted on October 20, 2019 by

Following the discovery of a question to which the answer is 42, the same team has now reported a sum of three cubes equal to 3.  As before, the result can be checked from Excel, linking to mpmath, via pyxll. … Continue reading →

Posted in Computing - general, Excel, Link to Python, Maths, Newton, PyXLL | Tagged , , , , , | Leave a comment

A problem with integers in VBA

Posted on October 1, 2019 by

A recent question at Quora asked: “Why am I getting an overflow error in Excel VBA when doing a simple arithmetic calculation like str1 = 24*60*30 where str1 is a variant or long or double?” I hadn’t encountered that problem … Continue reading →

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The answer to Life the Universe and Everything …

Posted on September 19, 2019 by

is 42, as is well-known: The actual question, to which the answer is 42, is not known, but a lesser known long standing question involving this number has recently been solved: The original problem, set in 1954 at the University … Continue reading →

Posted in Computing - general, Excel, Maths, Newton, PyXLL | Tagged , , , , | 5 Comments

Plotting Mandelbrot

Posted on September 15, 2019 by

There are many sites discussing the Mandelbrot Set, but not many examples using VBA to plot the set in Excel, so here is my effort: The spreadsheet (including open source VBA code) may be downloaded from: Mandelbrot chart.zip Note that … Continue reading →

Posted in Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, Newton, VBA | Tagged , , , | 3 Comments

Using conditional formatting with array formulas

Posted on August 17, 2019 by

A recent Quora question asked “How do I highlight the number closest to an initial number in a row in Excel?“.  The answer by Bill Jelen provides a good example of using conditional formatting with an array formula: In my … Continue reading →

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64 bit Excel and the Strand7 API

Posted on August 13, 2019 by

Back in May 2017 I posted a sample spreadsheet using the Strand7 API to allow Excel to read and write Strand7 node data and results.  A comment noted at the time that the spreadsheet was not working with 64 bit … Continue reading →

Posted in Excel, Finite Element Analysis, Frame Analysis, Link to dll, Newton, Strand7 | Tagged , | Leave a comment

64 bit Excel and PtrSafe

Posted on July 31, 2019 by

Installing my Office 365 subscription on a new computer I discovered it had decided (without asking) to upgrade itself to the 64 bit version, which resulted in some of my spreadsheets not working on the new system.  The main problem … Continue reading →

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