Month: June 2015

Windows terminal: the sort function

The tutor shares a great find on the Windows terminal. When I was a kid, we spent many hours, in grades three through six, rewriting lists of words in alphabetical order. The advantage was twofold: writing practice (which, back then,

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Physics: average velocity

The tutor illuminates a very plain, yet critical, concept from physics. Average velocity has the following definition: vave=displacement/time Displacement means your change in position. (Read more about the difference between distance and displacement in my post here.) Travelling straight-line, displacement

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Perl: a perfect squares list

The tutor offers a simple script to demonstrate the Perl range operator. Let’s imagine someone is studying radicals (which you’ll find numerous posts about here, by typing it in the search box). They want to memorize the perfect squares; a

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Tree identification: a tale of two trees

The tutor shares a confusing identification experience. In the woods where I walk, an old Sitka spruce always dominates the forest right around it. A large Sitka spruce is easy to spot by its scaly bark, rather than the vertical

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Chess: end game, part 0

The tutor opens the discussion about the end game in chess. At Killegar Chess, you can hear Sean Godley’s coverage of Aron Nimzowitsch’s My System, which is a leading resource for modern chess players. I’ve listened to many chapters there.

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Perl random walk simulation: code explanation

The tutor continues with some explanation of last post’s Perl random walk simulation. Below is the Perl code from last post, this time with some comments (recall that # denotes a comment in Perl): #!/usr/bin/perl # needed for Linux (Unix)

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Perl simulation: a random walk

The tutor returns to Perl programming with a random walk simulation. A really simple conception of a random walk is that the walker starts at 0 on the number line, then makes consecutive steps, each of which can either be

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Field guides, old memories: tree identification

The tutor reflects on summers past as he discusses his latest identification. I recall, growing up in the Annapolis Valley, Nova Scotia, a tree with deeply furrowed, dark grey bark, and compound leaves whose leaflets were rounded, not pointed. It

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English: more homonyms (aka homophones)

The tutor offers another couple of fun homonyms, or homophones, depending on which dictionary you use. Homonyms are a favoured topic here. Just key homophone or homonym in the search box to bring up a few earlier articles about them.

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Chess: GNU Chess

The tutor opens a discussion about the wide world of computer chess. Back in the 70s and 80s, you (theoretically) needed an opponent if you wanted to play chess. (I think I’ve read that Bobby Fischer, as a kid, usually