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Month: June 2021

Transform Axes Jun 2021

  • khoitsma
  • Excel, Mathematics, Python, PyXLL
  • 0 Comments

In structural engineering, we must constantly deal with axes transformations. Mostly we have right handed coordinates (RHC), but sometimes left handed coordinates (LHC).

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Protected: Parsing Feet Inches Sixteenths (FIS) Jun 2021

  • khoitsma
  • Excel, Mathematics, Python, PyXLL
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There is no excerpt because this is a protected post.

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Feet Inches Sixteenths (FIS) Calculator Jun 2021

  • khoitsma
  • Concept, Excel, Mathematics
  • 0 Comments


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Cogito Jun 2021

  • khoitsma
  • General, Personal
  • 0 Comments

Calculating devices

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ASCE Exact Wind Integration (closed form equations) Jun 2021

  • khoitsma
  • ASCE, Calculus, Cocalc, Excel, Jupyter, Mathematics, Python, PyXLL, SageMath
  • 0 Comments

I developed a Python function to calculate closed form exact values for wind forces and wind CGs.

I use only calculus — no bar charts with 0′ to 15′, 20′ to 25′, et cetera —- a curve rather than a step function. I present derivations and examples.

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Nefertiti Jun 2021

  • khoitsma
  • General
  • 0 Comments

So modern and yet so timeless

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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
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
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