Author Archives: dougaj4

mpmath for Excel

mpmath has been mentioned in passing here before, but not in any detail.  The mpmath site says: mpmath is a free (BSD licensed) Python library for real and complex floating-point arithmetic with arbitrary precision. It has been developed by Fredrik … Continue reading

Posted in Excel, Link to Python, Maths, PyXLL, UDFs, VBA, xlwings | Tagged , , , , , , , , | Leave a comment

Transferring large arrays with Pyxll

Pyxll is a commercial Excel add-in linking Excel and Python.  The latest version  offers greatly improved performance in transferring data between Excel and Python as Numpy arrays, amongst many other new features and improvements. To check what this means in practice, … Continue reading

Posted in Arrays, Excel, Frame Analysis, Link to Python, PyXLL, UDFs, VBA | Tagged , , , , , , | Leave a comment

Scarborough Fair

Scarborough Fair is a very old song, according to Wikipedia dating back at least to 1670, and probably much earlier.  Here are three versions from the mid-sixties. The first from Martin Carthy was released in 1965, on his first album: The … Continue reading

Posted in Bach | Tagged , , , | 2 Comments

More updates to ArcSpline and IP2

I have uploaded version 2.18 of the IP2 spreadsheet to: IP2.zip The new version includes updates to the IP, IP_4, and ArcSpline functions, as described below.  The download is free and includes full open-source code. The IP and IP_4 functions find … Continue reading

Posted in Arrays, Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | Leave a comment

More SciPy Solvers

The xlwings Scipy spreadsheet has been updated with a new example of the xl_SolveF function, that uses the Scipy Optimize root function.  The new spreadsheet can be downloaded from: xlScipy3.zip The new example uses a python function ic_calc (included in the … Continue reading

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

Solid Air – Norma Waterson

I don’t know how I missed this, but I just discovered yesterday: More about the album: The Very Thought of You On her second solo album the Grande Dame of British folk is presenting us with a surprising, inspired selection … Continue reading

Posted in Bach | Tagged , , , , | Leave a comment

Python Problems

I have recently returned to using Pyxll to link Excel to Python (of which more later), which required the installation of a 32 bit version of Python 3.7.  First trials after installation returned the message: “AttributeError: ‘module’ object has no … Continue reading

Posted in Computing - general, Link to Python, NumPy and SciPy | Tagged , , , | Leave a comment