Category Archives: Drawing

Mandelbrot, Mojo, Numpy and Numba

Posted on 06/10/2025 by dougaj4

I recently read an article about connecting Python to the new Mojo language: Python Can Now Call Mojo The article had some code examples, including code to plot the Mandelbrot set, comparing plain Python, Python with Numpy, and Mojo, and what … Continue reading →

Posted in Arrays, Drawing, Excel, Link to Python, Maths, Newton, NumPy and SciPy, 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

Upgrading plotly (to 6.9.1)

Posted on 19/07/2025 by dougaj4

Today I found that some of my plotly functions were not working, and re-loading the pyxll files returned the message “could not import PySide6.Qtgui pyside6”. Searching for this problem I found: After upgrading PySide6 gives error No module named ‘PySide6.QtWidgets’ … Continue reading →

Posted in Drawing, Excel, Link to Python, PyXLL | Tagged , , , , , , | Leave a comment

Calculating and plotting rotations

Posted on 19/06/2023 by dougaj4

This post was prompted by a recent post at Eng-Tips. The original problem seemed simple enough: Im trying to wirte a formula where I imput vessel heading and datum bore heading and it tells me FWD, STBD, AFT or PORT … Continue reading →

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

3D plots with the latest Matplotlib

Posted on 30/09/2022 by dougaj4

Installing Python on a new computer, I found I had to downgrade Matplotlib to release 3.5.2 to get my 3D plotting functions to work. Further investigation found that the problem was the Axes3D function. Changing:     ax = axes3d.Axes3D(fig)to: … Continue reading →

Posted in Animation, Coordinate Geometry, Drawing, Excel, Link to Python, Newton, NumPy and SciPy, PyXLL, UDFs | Tagged , , , , , , | 4 Comments