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“Odd Rock” on Mars Exhibits (Almost) Magic Square
A news story released yesterday, March 31,by c|net has the headline...
environ 3 ans il y a
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Mount St. Helens and Matrix Rank
What do Mount St. Helens and the rank of a matrix have in common? The answer is the MATLAB function peaks. Let me explain....
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Round, With Tie Breakers, Round Three
I recently published Round, With Ties to Even and followed that with Round Two. Then, in an email, Andy Bartlett pointed...
environ 3 ans il y a
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Round, With Tie Breakers, Round Two
I published Round, With Ties to Even a couple of days ago. Steve Eddins and Daniel Dolan immediately had substantive...
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Round, With Ties to Even
We are considering a MATLAB Enhancement Request to support options for round(x) when x is exactly halfway between two...
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CR and CAB, Rank Revealing Matrix Factorizations
The rank of a linear transformation is a fundamental concept in linear algebra and matrix factorizations are fundamental...
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Holiday Greetings 2020
I want to share some colorful images featuring the seven colors in the MATLAB axes color order....
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A Famous Equation, x^2 = 2^x
A recent episode of the popular YouTube channel "blackpenredpen" is about solutions to the famous equation... read more...
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Paul Saylor, 1939-2020
My friend Paul Saylor passed away on November 7th....
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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...
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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...
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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...
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Two Dubious Ways to Solve A*X = X*B, part 1
Recently, I had email from a student in Italy....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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Precise Setting of a Delicate Parameter with “pibar”
(A slight revision of the post I made a few hours ago.)...
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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...
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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...
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COVID-19 Simulator
ContentsSimulatorAnimationFirst frameFinal frameFull barrierNo barrierLarger populationSmaller...
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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...
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Gene Golub’s 22nd Birthday
Tomorrow, February 29, 2020 would be Gene Golub's 22nd birthday....
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