Archive for scientific computing

Nature snapshot

Posted in Statistics with tags , , , , , , , on March 5, 2017 by xi'an

The recent issue of Nature, as of Jan 26, 2017!, contained a cartload of interesting review and coverage articles, from the latest version of the quantum computer D-Wave, with a paragraph on quantum annealing that reminded me of a recent arXiv paper I could not understand, seemingly turning the mathematical problem of multivariate optimisation into a truly physical process, to the continuing (Nature-wise) debate on how to oppose Trump, to the biases and shortcomings of policing software, with a mention of Lum and Isaac I discussed here a few months ago, to the unsuspected difficulty to publish a referee’s report when the publisher is Elsevier (unsuspected and unsurprising!)—although I know of colleagues and authors disapproving my publishing referee’s reports identified as such—, to an amazing picture of a bundle of neurons monitored simultaneously, to an entry in the career section on scientific computing and the importance of coding for young investigators, with R at the forefront!

winning entry at MCqMC’16

Posted in Books, Kids, pictures, Statistics, Travel, University life with tags , , , , , , , on August 29, 2016 by xi'an

mcqmc4The nice logo of MCqMC 2016 was a collection of eight series of QMC dots on the unit (?) cube. The organisers set a competition to identify the principles behind those quasi-random sets and as I had no idea for most of them I entered very random sets unconnected with algorithmia, for which I got an honourable mention and a CD prize (if not the conference staff tee-shirt I was coveting!) Art Owen sent me back my entry, posted below and hopefully (or not!) readable.dots

can we trust computer simulations?

Posted in Books, pictures, Statistics, University life with tags , , , , , , , , , , , , , , , , , , , on July 10, 2015 by xi'an


How can one validate the outcome of a validation model? Or can we even imagine validation of this outcome? This was the starting question for the conference I attended in Hannover. Which obviously engaged me to the utmost. Relating to some past experiences like advising a student working on accelerated tests for fighter electronics. And failing to agree with him on validating a model to turn those accelerated tests within a realistic setting. Or reviewing this book on climate simulation three years ago while visiting Monash University. Since I discuss in details below most talks of the day, here is an opportunity to opt away! Continue reading