Blog Archives

Four Simple Turtle Graphs To Play With Kids

July 7, 2014
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Four Simple Turtle Graphs To Play With Kids

Technology is just a tool: in terms of getting the kids working together and motivating them, the teacher is the most important (Bill Gates) Some days ago I read this article in R-bloggers and I discovered the TurtleGraphics package. I knew about turtle graphics long time ago and I was thinking of writing a post

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How To Approximate Pi With A Short Pencil And A Big Paper

July 1, 2014
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How To Approximate Pi With A Short Pencil And A Big Paper

Experiment, be curious: though interfering friends may frown, get furious at each attempt to hold you down (Tony Bennett, Experiment) Instructions: Take a pencil and measure it Take a piece of paper and draw parallel lines on it (you can use the pencil, of course); separation between lines should double the length of the pencil Toss the pencil

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The Goldbach’s Comet

June 22, 2014
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The Goldbach’s Comet

Every even integer greater than 2 can be expressed as the sum of two primes (Christian Goldbach, 1742) The point cloud known as Goldbach’s Comet represents the amount of different ways (y axis) an even number (x axis) can be writen as sum of two prime numbers. In this plot, x axis is between 2 and

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The Ikeda’s Galaxy

June 17, 2014
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The Ikeda’s Galaxy

Chaos is the score upon which reality is written (Henry Miller) Nonlinear dynamical systems are an enormous seam of amazing images. The Ikeda Map is an example of strange attractor which represents the movement of particles under the rules of certain differential equations. I have drawn the trajectories followed by of 200 particles under the

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The Gilbreath’s Conjecture

June 12, 2014
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The Gilbreath’s Conjecture

317 is a prime, not because we think so, or because our minds are shaped in one way rather than another, but because it is so, because mathematical reality is built that way (G.H. Hardy) In 1958, the mathematician and magician Norman L. Gilbreath presented a disconcerting hypothesis conceived in the back of a napkin. Gilbreath

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The Three Little Pigs

June 8, 2014
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The Three Little Pigs

Jesse, you asked me if I was in the meth business or the money business. Neither. I’m in the empire business (Walter White in Breaking Bad) The game of pig has simple rules but complex strategies. It was described for the first time in 1945  by a magician called John Scarne. Playing the pig game

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floweR

June 2, 2014
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floweR

It is the time you have wasted for your rose that makes your rose so important (Antoine de Saint-Exupéry, The Little Prince) Yesterday I found a package called circular and I could not suppress to do this: Make your own floweRs:

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How Do Cities Feel?

May 27, 2014
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How Do Cities Feel?

If you are lost and feel alone, circumnavigate the globe (For You, Coldplay) You can not consider yourself a R-blogger until you do an analysis of Twitter using twitteR package. Everybody knows it. So here I go. Inspired by the fabulous work of Jonathan Harris I decided to compare human emotions of people living (or

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Shakespeare Is More Monkey-Friendly Than Cervantes

May 19, 2014
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Shakespeare Is More Monkey-Friendly Than Cervantes

Ford, there is an infinite number of monkeys outside who want to talk to us about this script for Hamlet they have worked out (from Episode 2 of The Hitchhiker’s Guide to the Galaxy by Douglas Adams) Some days ago I was talking with a friend about the infinite monkey theorem which is a funny

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The mnemoneitoR

May 8, 2014
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The mnemoneitoR

AND I HAVE A GREAT REJOICING DAY (mnemonic rule generated by mnemoneitoR for first 7 digits of Pi according to The Wonderful Wizard Of Oz) Is there some number impossible to memorize? Do not worry, here comes mnemoneitoR: the tool that you was always looking for! With mnemoneitoR you can translate any number into an easy-to-remember phrase

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