Category Archives: UDFs

Python functools – cache and lru_cache

Posted on 01/04/2022 by dougaj4

Update 3rd April 2022: Following the comment from Larry Schuster I have modified the code so that the factorial0 function actually uses cache as intended, rather than lru_cache. I also added code to clear the cache after each timer run, … Continue reading →

Posted in Excel, Link to Python, PyXLL, UDFs | Tagged , , , , , , , | 3 Comments

VBA procedures for the Numerical Analysis of Tabular Functions

Posted on 12/03/2022 by dougaj4

Long time on-line friend Alfred Vachris has recently been converting Fortran code developed through his working career into VBA: I had the opportunity to work at Grumman while going to Graduate School and they gave me a part-time job as … Continue reading →

Posted in Coordinate Geometry, Curve fitting, Excel, Fortran, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 1 Comment

Display Matplotlib animations in Excel

Posted on 28/02/2022 by dougaj4

The latest version of pyxll (5.4.0) allows animations generated in Matplotlib to be simply copied to Excel. A spreadsheet with the examples shown below, and the associated Python code can be downloaded from: Animations2.zip The screenshot below shows the simple … Continue reading →

Posted in Animation, Drawing, Excel, Link to Python, Maths, Newton, NumPy and SciPy, PyXLL, UDFs | Tagged , , , , , , , | 3 Comments

Rounding to significant figures

Posted on 17/02/2022 by dougaj4

Edited 19th Feb 22, following comment from Larry Schuster Excel does not have a function to round numbers to a specified number of significant numbers, and (rather to my surprise) neither does Python. It is not too hard to write … Continue reading →

Posted in Excel, Link to Python, Maths, NumPy and SciPy, PyXLL, UDFs, VBA | Tagged , , , , , , | 7 Comments

Contour plots with Excel and Matplotlib – 2 

Posted on 30/12/2021 by dougaj4

The procedures discussed in the previous post required the contour data to be arranged on a regular rectangular grid, with the data points listed in a 2D array. As far as I know there is no built in alternative in … Continue reading →

Posted in Arrays, Charts, Excel, Finite Element Analysis, Link to Python, Newton, NumPy and SciPy, PyXLL, Strand7, UDFs | Tagged , , , , | 1 Comment