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GOD JUL

December 23, 2007

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God Jul allihopa!

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The COVID-19 testing delays in Sweden as a prime example of queueing theory

One branch of statistics is Queueing Theory . It is an attempt to predict the behaviour of a system as a function of the inflow and the outflow. As examples you typically have either bank tellers or buffered network routers, but now we have an excellent example in front of us in the Swedish news. One tool in the fight against the COVID-19 pandemic is testing. By tracking who is infected we can better prevent it from spreading to others, but for that to work, we need the test done and the test result returned before the person has already spread the virus. In Sweden we expanded the testing capactity slowly but steadily during May and June and all through this process the waiting time, if you were allowed to get a test, was short. As vacations ended and autumn colds came, that changed. Now people may have to wait for 4 days to get a test done and for another 4 days before the result is returned, despite labs working more efficiently and faster than ever before and returning 50% more

A better algorithm for paths with gradients

To code example → This article will present an algorithm, and code, to create the effect in the image below, where a gradient follows along a shape, a "path" in SVG parlance. This is not the first attempt at solving this problem, thus the "better" part of the title, but I found earlier available code to have some very specific flaws, especially with complex paths. By default, SVG provides for two ways to do gradients, linearGradient and radialGradient. As the names imply, the gradient for those either follows a straight line or a circular radius. In particular, there is no way in SVG to have a gradient evolve along a path. Linear Gradient Radial Gradient If you try to apply either gradient to a path, you will see that it is just applied along a line or along a ra

Package of quotes

As I upgraded my Kindle, I extracted all the highlights I had done on it. These go from incredulous, to insightful, to funny or only informative. Here they are - and if you wonder why I highlighted anything in particular, just ask. These were collected between 2012 and very recently. They probably say more about me than the ones writing them. Three Men in a Boat ( Jerome K. Jerome ) Monday, 13 August 12 01:22:56 “a general disinclination to work of any kind.” Poirot investigates ( Agatha Christie ) Sunday, 2 September 12 00:16:38 pusillanimous Double Cross ( Ben Macintyre ) Sunday, 16 September 12 08:47:51 Indeed, there was very little work to do, since the Germans believed that “the characteristics of the Portuguese—their love of the melodramatics, their rumour-mongering and their general undependability—made them poorly fitted for the work of agents.” Double Cross ( Ben Macintyre ) Sunday, 16 September 12 09:10:49 asking the Swedish air

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