**R**obin Ryder started his new blog with his different solutions to **Le Monde** puzzle of last Saturday (about the algebraic sum of products…), solutions that are much more elegant than my pedestrian rendering. I particularly like the one based on the Jacobian of a matrix! (Robin is doing a postdoc in Dauphine and CREST—under my supervision—on ABC and other computational issues, after completing a PhD in Oxford on philogenic trees for language history with Geoff Nicholls. His talk at the Big’MC seminar last month is reproduced there.)

**A**nd, in a totally unrelated way, here is the Sudoku (in **Le Monde**) that started my post on simulated annealing, nicely represented on Revolutions. (Although I cannot see why the central columns are set in grey…) I must mention that I am quite surprised at the number of visits my post received, given that using simulated annealing for solving Sudokus has been around for a while. Even my R code, while original, does not compete with simulated annealing solutions that take a few seconds… I thus completely share Dirk Eddelbuettel‘s surprise in this respect (but point to him that Robin’s blog entry has nothing to do with Sudokus, but with another **Le Monde** puzzle!)

Filed under: R, Statistics, University life Tagged: Le Monde, linguistics, philogenic trees, sudoku

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**Tags:** Le Monde, linguistics, philogenic trees, R, statistics, sudoku, University life