Category Archives: Maths

Long integers in Python and Excel and py_Fact

Posted on 27/08/2025 by dougaj4

I have added a new py_Fact function to the py_Scipy module, that returns the factorial of an integer as a float if it is up to 15 digits long, or a string for longer numbers. The revised code, and the … Continue reading →

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

Python functions for rotation

Posted on 22/08/2025 by dougaj4

I have recently needed code to rotate 2D coordinates, either about the origin, or some specified other point, using pyxll to call the code from Excel. My first attempt was a direct translation of some VBA code, that also worked … Continue reading →

Posted in Coordinate Geometry, Excel, Link to Python, Maths, Newton, PyXLL | Tagged , , , , , , | Leave a comment

Evaluate and display definite integrals in Excel with Latex and Matplotlib

Posted on 09/08/2025 by dougaj4

The py_Evalu spreadsheet was last presented at Scipy Functions with Excel and pyxll 5 – Evaluate with Units and included the Plot_Math function, which converts a text string to Latex format, then uses Matplotlib to convert this to a graphic image, … Continue reading →

Posted in Excel, Link to Python, Maths, Newton, Numerical integration, PyXLL, UDFs | Tagged , , , , , , , , , , , , | Leave a comment

Plotting Carlyle’s Circle with Matplotlib in Excel

Posted on 25/07/2025 by dougaj4

Recently I happened to read of Carlyle’s Circle, which is a circle that has two intersection points with a parabola on the X axis. See the Wikipedia article for more details: https://en.wikipedia.org/wiki/Carlyle_circle This post looks at the options for plotting … Continue reading →

Posted in Charts, Drawing, Excel, Link to Python, Maths, Newton, PyXLL, UDFs | Tagged , , , , , , | Leave a comment

The iccanobiF Sequence

Posted on 09/07/2025 by dougaj4

Coincidentally, following the previous post, New Scientist’s regular brain teaser featured the iccanobiF Sequence, which is just like the Fibonacci Sequence, except that after adding the two previous numbers the digits of the results are reversed. Obviously the sequences are … Continue reading →

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