Category Archives: Maths

IP2 and IP2_py

Posted on 11/09/2015 by dougaj4

The IP2 spreadsheet provides functions to calculate: Intersection points of 2D lines or polylines Intersection points of 2 circles, or a line and a circle Intersection circle of two spheres and intersection points of 3 spheres 3D centre point of … Continue reading →

Posted in Coordinate Geometry, Excel, Link to Python, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , , , | 5 Comments

A Loopy Link (and three more)

Posted on 23/08/2015 by dougaj4

For some reason Doug Glancy’s Excel Blog has escaped my attention up till now, but having a browse today, I discovered this loopy animation: which would not have been out of place in Douglas Hofstadter’s “I am a Strange Loop” I really … Continue reading →

Posted in Animation, Computing - general, Excel, Maths, Newton, VBA | Tagged , , , , , | 2 Comments

A mystery curve links to Jupyter

Posted on 16/07/2015 by dougaj4

Reviewing some of my less visited links recently, I was intrigued by a post at The Math Less Travelled: The previous post at the site provides more details of the source of the curve, and some links to an interactive … Continue reading →

Posted in Charts, Charts, Excel, Maths, Newton | Tagged , , , , , , | 2 Comments

Section Properties – Lunes and Groups

Posted on 08/07/2015 by dougaj4

Following a discussion at Eng-Tips and resulting comments I have updated my Section Properties spreadsheet to include calculation of the area and centroid of a “Lune” (the shape of a crescent moon).  I have also added a “Re-draw Shape” button because … Continue reading →

Posted in Drawing, Excel, Maths, Newton, VBA | Tagged , , , , | 2 Comments

xlSciPy 1.01

Posted on 05/05/2015 by dougaj4

The xlSciPy spreadsheet, introduced here, has been updated with many new functions.  The new version, including full open source code (VBA and Python) can be downloaded from: xlSciPy.zip The spreadsheet requires Python to be installed, including NumPy and SciPy.  It … Continue reading →

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