Author Archives: dougaj4

A Hard Rain

Posted on 21/10/2017 by dougaj4

I happened to be looking at an old post here; Various routes to and from Nottamun Town, featuring Bob Dylan’s performance of A Hard Rain’s Gonna Fall, which led me to Patti Smith’s performance of the same song at last year’s … Continue reading →

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Using Flash Fill

Posted on 14/10/2017 by dougaj4

There have been several posts here on using functions or user defined functions (UDFs) to extract text or numbers from a longer string (most recently, here), but for many purposes it is quicker and easier to use the “flash-fill” feature, … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , | 1 Comment

Hofstadter, Pahud, Bach

Posted on 08/10/2017 by dougaj4

The latest ACO concert series features the Swiss flautist Emmanuel Pahud (interview here). The performance included J.S. Bach’s 6 Part Ricercar, from The Musical Offering, which was the inspiration for the final dialogue in Douglas Hofstadter’s Godel, Esher, Bach: Achilles … Continue reading →

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Working with implied units – update

Posted on 30/09/2017 by dougaj4

Following comments at Eng-Tips I have added two examples with different procedures for evaluating ACI equations for the flexural tensile strength of concrete here.

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Using Alglib least-squares solvers

Posted on 23/09/2017 by dougaj4

Following the last post on using the Python version of Alglib from Excel, via xlwings, this post looks in more detail at alternatives for fitting a non-linear function to a set of data, using the Levenberg-Marquardt method.  The spreadsheet with … Continue reading →

Posted in AlgLib, Curve fitting, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings | Tagged , , , , , , , , , , | 2 Comments