Yesterday I was reading this article in “Physics Today” where the authors discuss about how to predict scientists’ future impact. What sounds like crystal ball gazing has been scientifically investigated over the last years. Having a reliable prediction about a…
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Yesterday I was trying to find a bug in my source code which lead to quite unexpected results. I thought that I narrowed down the possible origin and will be able to localize the problem within a short time. However,…
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The title of this post is maybe not correct in a mathematical sense, but I was asking myself if there exists an estimator for the “standard deviation of a standard deviation” or a kind of error bound for a sample…
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It is raining since more than 24 hours in Tokyo. Nothing unusual for this time of the year, since we are close to the beginning of the raining season in Japan. This morning when I walked with my umbrella through…
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Playing with partial differential equations can be great fun. I guess the shallow water equations are one of the most easiest to understand system, which have a clearly visible impact in daily life. It does not matter if you have…
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Random walk is the mathematical formalization of a path which consists of a succession of random steps. In the simplest (one-dimensional) case, the particle (or object of interest) propagates by a certain distance which is obtained from a random generator.…
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Imagine you have a text (ASCII) file that holds a table/matrix, e.g. A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 but what you need, is the information transposed, i.e. A1 B1 C1 A2…
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U.S. president Obama was required by law to issue a sequestration order which cancels about 85 billion USD in budgetary resources across the federal government for the remainder of the fiscal year 2013. Of course there are still plans to…
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In the recent days there have been a lot of rumours about deadly asteroids or meteorites (don’t mix those two!!!). For those of you who are worrying, here are the facts:
Twice a year people can watch a interesting phenomenon in the crowded city center of Manhattan – the Manhattanhenge or Manhattan Solstice. What happens exactly is that ” .. the setting sun aligns with the east–west streets of the main…
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