Author Archives: dougaj4

py_RC Design with 3D Cache

Posted on 12/07/2026 by dougaj4

Following my recent post on passing 3D arrays from Python to Excel I have now added a py_UmomC function to the py_RC Design spreadsheet. The new spreadsheet and Python code, along with related code, can be downloaded from: py_RC Design.zip … Continue reading →

Posted in Arrays, Beam Bending, Concrete, Excel, Link to Python, Newton, NumPy and SciPy, PyXLL, UDFs | Tagged , , , , , , , , , , | Leave a comment

Josh Turner

Posted on 05/07/2026 by dougaj4

We haven’t had any Bach posts for a bit, so here is new (to me) guitarist Josh Turner playing a cover of Bert Jansch’s version of Blackwaterside: and another example of his varied work, a cover of Nick Drake’s Three … Continue reading →

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VBA polynomial functions update

Posted on 29/06/2026 by dougaj4

Following several comments at an old post I have made updates to the Polynomial spreadsheet. The new files can be downloaded from: Polynomial.zip The changes are: New functions returning real roots only: Updated SolvePoly and SolvePolyR: SolvePoly with an array … Continue reading →

Posted in Excel, Link to Python, Maths, Newton, NumPy and SciPy, PyXLL, UDFs, VBA | Tagged , , , , , , , | Leave a comment

Passing 3D arrays to Excel with Python and pyxll

Posted on 18/06/2026 by dougaj4

The previous post looked at options for displaying 1D or 2D arrays in Excel. This post will look at passing 3D arrays from Python to Excel as a cache object, using pyxll, and how to extract selected data from the … Continue reading →

Posted in Arrays, Excel, Link to Python, Newton, PyXLL, UDFs | Tagged , , , , , | 1 Comment

Dynamic array update and the @ operator

Posted on 11/06/2026 by dougaj4

Many of the user defined functions (UDF’s) presented in this blog return an array rather than a single value. Options for displaying arrays in Excel have changed significantly in recent years and this post looks at the most efficient ways … Continue reading →

Posted in Arrays, Excel, Link to Python, PyXLL, UDFs, VBA | Tagged , , , , , , , , | 1 Comment