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Anticipating Official U.S. Census for 2020
On October 13, the U.S. Supreme Court ruled that the U.S. Census Bureau could stop the 2020 census early. Here is a link to...
5 years 前
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Notes on CR and west0479
My post a few days ago, Gil Strang and the CR Matrix Factorization, generated a lot of email. Here is the resulting...
5 years 前
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Gil Strang and the CR Matrix Factorization
My friend Gil Strang is known for his lectures from MIT course 18.06, Linear Algebra, which are available on MIT...
5 years 前
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Two Dubious Ways to Solve A*X = X*B, part 1
Recently, I had email from a student in Italy....
5 years 前
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Addition to SVD and Partisanship in the U. S. Senate
I have added this section to my post a few weeks ago about using the SVD to measure partisanship in the United States...
5 years 前
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SVD Quantifies Increasing Partisanship in the U. S. Senate
Many observers have noted that the United States Senate has become increasingly partisan in recent years. Votes are being...
5 years 前
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Collatz Inequality and Singleton Expansion
I've blogged about this gem from Lothar Collatz (1910-1990) before, but it deserves to be repeated. Especially since it now...
5 years 前
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Serendipity, Kuramoto, Colleagues and Backslash
Alexa tells me that the definition of serendipity is "the occurrence and development of events by chance in a happy or...
5 years 前
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A Mesmerizing Animation
A Mesmerizing AnimationWe are working on a paper about the Kuramoto model of self-synchronizing oscillators. This animation...
5 years 前
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History of MATLAB Published by the ACM
"A History of MATLAB", a 67-page paper that Jack Little and I have written, has been published by the ACM, the Association...
5 years 前
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Moler on E-NLA, Wednesday, May 27
It has been a while since I made a blog post. It is because I am preparing to give a talk next week on"The Evolution of...
5 years 前
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Precise Setting of a Delicate Parameter with “pibar”
(A slight revision of the post I made a few hours ago.)...
5 years 前
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John Horton Conway
John Horton ConwayFrom the New York Times, April 15, 2020John Horton Conway, a ‘Magical Genius’ in Math, Dies at... read...
5 years 前
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Second Version of a COVID-19 Simulator
I have completely rewritten the COVID-19 simulator that I described in last week's blog post and I now have a second...
5 years 前
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COVID-19 Simulator
ContentsSimulatorAnimationFirst frameFinal frameFull barrierNo barrierLarger populationSmaller...
5 years 前
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It is Friday the 13th Again
Today is Friday, March 13, 2020. In many parts of the world, Friday the 13th is considered unlucky. I've written blog...
5 years 前
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Gene Golub’s 22nd Birthday
Tomorrow, February 29, 2020 would be Gene Golub's 22nd birthday....
5 years 前
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Roundoff Patterns from Triple Kronecker Products
While I was working on my posts about Pejorative Manifolds, I was pleased to discover the intriguing patterns created by the...
5 years 前
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Pejorative Manifolds of Polynomials and Matrices, part 2
In an unpublished 1972 technical report "Conserving confluence curbs ill-condition," Velvel Kahan coined the descriptive...
5 years 前
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Pejorative Manifolds of Polynomials and Matrices, part 1
In an unpublished 1972 technical report "Conserving confluence curbs ill-condition," Velvel Kahan coined the descriptive...
5 years 前
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MathWorks Blue Meets Air Force Academy Blue
I have always been fascinated by the names that are used to describe colors. There are dozens of web sites with lists of...
6 years 前
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Christmas Greetings 2019
Inspired by Patsy and https://www.amazon.com/gp/product/B075JDVR53. type xmas_2019.m function xmas_2019 %...
6 years 前
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A Matrix for the New HPL-AI Benchmark
My colleagues are looking for a matrix to be used in a new benchmark. They've come to the right place....
6 years 前
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Color Order for Line Plots
Line plots with a color order from one of our color maps are useful, and pretty....
6 years 前
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Stability of Kuramoto Oscillators
I am working with Indika Rajapakse and Steve Smale to investigate the stability of the dynamic system describing Kuramoto...
6 years 前
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Prime Spiral #2
Today's post was inspired by a YouTube video, Why do prime numbers make these spirals?, on the channel 3Blue1Brown, created...
6 years 前
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Experiments With Kuramoto Oscillators
I have learned a lot more about Kuramoto oscillators since I wrote my blog post three weeks ago. I am working with Indika...
6 years 前
