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Best of Seven Outcome Probability Dec 2020

  • khoitsma
  • General, Kids (middle school and up), Plotly, Probability/Statistics, Python
  • 0 Comments

There must be 70 ways to … win the playoff.

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From Punch Cards to Flash Memory Dec 2020

  • khoitsma
  • Concept, Hardware, History
  • 0 Comments
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D Day Paratroopers June 1944

  • khoitsma
  • History, Personal
  • 0 Comments

Images dedicated to Arnold Lee Eddins (Nancy’s father)

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Multi-Dimension Data Table using PyXLL (with video) Dec 2020

  • khoitsma
  • Concept, Excel, Python, PyXLL, Video
  • 2 Comments

I coded a PyXLL macro that builds a multi-dimension data table (MDDT).

The native Data Table provided by Excel is useful but limited to two variables.

My version is set up for 5 independent variables and an unlimited (theoretically) number of dependent variables. Five was an arbitrary choice; some limitation is required here.

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PyXLL to Jupyter Interface (with video) Dec 2020

  • khoitsma
  • AISC, Excel, Jupyter, Python, PyXLL, Video
  • 0 Comments

This example is an actual serious structural engineering calculation with graphical documentation.

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PyXLL Custom Task Panes in Excel (with automated drawings and video) Nov 2020

  • khoitsma
  • AISC, Excel, PyQt, Python, PyXLL, Video
  • 0 Comments

The PyXLL/Jupyter interface would be drab without custom menus and graphical feedback.

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  • Close Encounters in Batting Averages July 2025
  • 2D Engineering Interpolation Jun 2025
  • The Bookshelf May 2025
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Short Takes
My Dash apps

My GeoGebra app
What is the most general equation for the area of a triangle?
The Wait calculation
The incessant obsolescence postulate (IOP)
Barnard’s Star and the 'Wait Equation'
IOP counterargument
The amazing arbelos (best on large screen)
Surprises found in the arbelos (1954)
Arbelos from Wolfram MathWorld
Circle Theorems
• Circle Theorems Marked
• Circle Theorems — Practice
Two Semicircles
Japanese temple geometry
★ Sister Celine — a beautiful life
★ John Lienhard IV on Ingenuity
★ Charles Stutzenbaker, Field Biologist
Neal Stephenson on the OS
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Pentagonal number visual proof

Bayes theorem visual proof

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