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Author: khoitsma

Structural engineer, Python programmer

Excel Dropdown with NO worksheet data list — redux Aug 2021

  • khoitsma
  • Excel, Python, PyXLL
  • 0 Comments

I decided to delete this post … There are limits to the number of items that will show in a data validation drop down list: The list can show up to show 32,767 items from a list on the worksheet. If you type the items into the data validation dialog box (a delimited list), the […]

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Texas — Residential & Commercial Inspections Aug 2021

  • khoitsma
  • General
  • 0 Comments

Looks like a comprehensive set of services.

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Terms of Venery Aug 2021

  • khoitsma
  • General
  • 0 Comments

A tease of terms

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Maplesoft — Maple 2021 Jul 2021

  • khoitsma
  • Maple, Mathematics
  • 0 Comments

Using Maplesoft Maple 2021, I revisited my previous equation for beta_w, and was able to simplify the equation.

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My Observations Jul 2021

  • khoitsma
  • Kids (middle school and up), Observation, Personal
  • 0 Comments

Noticed in passing

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Engineering Cost Estimates Jul 2021

  • khoitsma
  • Concept, Engineering, Mathematics, NotebookLM
  • 0 Comments

Uncertainty analysis illustrates simple but often ignored concepts.

Features
Gemini button

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Older posts
Newer posts

Recent Posts

  • The Triangle of Minimum Perimeter Nov 2025
  • NotebookLM Cather Oct 2025
  • Minimal Footprint Dropdowns in Excel Oct 2025
  • Bow Out Aug 2025
  • Automated Foundation Rebar Drawing Aug 2025
  • Close Encounters in Batting Averages July 2025
  • 2D Engineering Interpolation Jun 2025
  • Lessons Learned (structural engineering) Apr 2025
  • Marimo Notebook Mar 2025
  • Fixed Fixed Beam with a Moment at any Point — Superposition Mar 2025
  • NotebookLM Feb 2025

Archives

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Instant Access to all Posts
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 (only good on a real desktop)
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
A few quotations

Tyler TX weather • 🌡 Steve Fitzgerald
Tyler TX weather • 3-day history
Tyler TX weather • calendar month
Tyler TX weather • graph month
East Texas weather • TAMU
★ All of the water in the world

Hacker News (from YCombinator)
Diaorifa
  • Home
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Pentagonal number visual proof

Dice Distribution (bar)

Bayes theorem visual proof

Bayes icon