Let me tell you about MATLAB's controversial function rat.... 続きを読む >>

I recently acquired a GPU, a graphics processing unit. It's called a GPU because such processors were originally intended to speed up graphics. But MATLAB uses it to speed up computation. Let's see how the gpuArray object benchmarks on my machine. I have been doing computer benchmarks for years. I like to do profiles where I vary the size of a task and see how the amount of memory required affects performance. I always learn something unexpected when I do these profiles. Ben Todoroff is on the MathWorks Parallel Processing team. Last year he contributed #34080, gpuBench to the MATLAB Central File Exchange. He has been able to compare several different GPUs. I am going to consider the performance of only one GPU, but in more detail. Important note. This is only about double precision. Single precision is another story. ... 続きを読む >>

VAXBARN Restores Vibrating Membrane on Ardent Titan dore_frame This is a short post to point to a web site in the Netherlands, VAXBARN. The site proprietor, Camiel Vanderhoeven, is assembling a... 続きを読む >>

MathWorks is creating a deck of playing cards that will be offered as gifts at our trade show booths. The design of the cards is based on Penrose Tilings and plots of the Finite Fourier Transform Matrix.... 続きを読む >>

I am addicted. I keep coming back to John Conway's Game of Life. Years ago, I wrote a chapter about Life in Experiments with MATLAB. I wrote a three-part series about Life shortly after I started blogging. Part 1, Part 2, Part 3. I have recently made significant enhancements to my MATLAB program for Life. I never seem to finish the code because I get diverted by actually using the program to explore the Universe. I invite you to join me. But, fair warning, you might become addicted too.... 続きを読む >>

Find the optimum traveling salesman tour through the capitals of the 48 contiguous states in the USA.... 続きを読む >>

Create a MATLAB® graph object from information about neighbors among the 48 contiguous states in the USA.... 続きを読む >>

I probably first saw this matrix in 1960 in John Todd's class at Caltech. But I forgot about it until Tahar Loulou jogged my memory with a comment following my blog post in late May. It deserves a place in our gallery of interesting matrices.... 続きを読む >>

Antarctic Ships, Fractal and RealDavid Wilson, from the Auckland University of Technology in New Zealand, has alerted me to this remarkable coincidence. Here is the "Burning Ship" from my post... 続きを読む >>

Camille Jordan (1838-1922)... 続きを読む >>