/2020-02-09T17:18:09+01:002020-02-09T17:18:09+01:002020-02-09T17:18:09+01:00Omar Gutiérreztag:None,2020-02-09:/log-of-dreams.html

<p>I want to register the dreams I remember when I wake up.</p>

<h1>The green bike</h1> <h2>Saturday, February 8, 2020</h2> <p>I went to play basketball to the park of Macultepec, meanwhile, I was going there, I was thinking that maybe I should watch some basketball videos on Youtube to learn to play better. </p> <p>When I was already playing, I threw the ball to some bikes parked in the corner, accidentally I hit one green color bike, which felt to the ground; some guys came to see what's going on, among them, a girl, who was precisely the owner of the green bike... I told her that I was interested in MTB, she told me that they knew some routes, but not precisely MTB routes... </p> <p>She asked me about my phone number to stay in contact and go to some rides together, I think the other guys were her brothers... I was trying to remember my phone number from Germany, to impress her, but I couldn't, then I woke up.</p> <p>So, I will buy a basket ball today.</p>2019-04-01T00:00:01+02:002019-04-01T00:00:01+02:00Omar Gutiérreztag:None,2019-04-01:/deutsch-phrases.html

<p>Some notes to help me to learn German.</p>

<p>I will compile, <strong>nach und nach</strong>, useful (and not so useful) phrases in German that I will master <em>nach und nach</em> to improve my skills in that language.</p> <p>I am also jotting down its equivalents in Spanish:</p> <h2>Daily phrases</h2> <table> <thead> <tr> <th><em>Deutsch</em></th> <th>Español</th> </tr> </thead> <tbody> <tr> <td><em>Hast du Kleingeld dabei?</em></td> <td><strong>¿Tienes (tú) cambio?</strong></td> </tr> <tr> <td><em>Haben Sie Kleingeld dabei?</em></td> <td><strong>¿Tiene (usted) cambio?</strong></td> </tr> <tr> <td><em>Ist dieser Platz (noch) verfügbar?</em></td> <td><strong>¿Está (todavía) disponible este lugar?</strong></td> </tr> <tr> <td><em>Sitzt hier (schon) jemand?</em></td> <td><strong>¿Hay (ya) alguien sentado aquí?</strong></td> </tr> </tbody> </table> <h2>Mottos</h2> <table> <thead> <tr> <th><em>Deutsch</em></th> <th>Español</th> </tr> </thead> <tbody> <tr> <td><em>Es ist niemals zu spät</em></td> <td><strong>Nunca es demasiado tarde</strong></td> </tr> <tr> <td><em>Es ist OK, nicht OK zu sein</em></td> <td><strong>Está bien no sentirse bien</strong></td> </tr> </tbody> </table> <h2>More phrases</h2> <table> <thead> <tr> <th><em>Deutsch</em></th> <th>Español</th> </tr> </thead> <tbody> <tr> <td><em>Seit jeher</em>...</td> <td><strong>Desde siempre...</strong></td> </tr> </tbody> </table>2019-04-01T00:00:01+02:002019-04-01T00:00:01+02:00Omar Gutiérreztag:None,2019-04-01:/spark-and-scala.html

<p>Some notes about Scala and Spark</p>

<p>These notes are merely random tricks that I learn in my journey with Scala.</p> <h1>Spark</h1> <p>Spark has transformation functions.</p> <h2>Facts to take into account</h2> <ul> <li><code>CombineByKey</code> is preferred over <code>GroupByKey</code>.</li> <li>Dealing with <code>Spark</code> and <code>Hadoop</code> require us to have a in mind that we are working in a distrubuted setting.</li> <li>The <code>-byKey</code> methods operate on <code>PairwiseRDD</code>s.</li> </ul> <h1>Scala</h1> <h2><code>Seq</code> and <code>Vector</code> vs <code>BufferList</code></h2> <p>To add an element to <code>Seq</code> I use this: <code>:+</code>.</p> <h2><code>apply</code> functions</h2> <p>I liked this one, to get the element <code>i</code> from a <code>Seq</code> object, we write this: <code>seq apply i</code>.</p> <h1>Scope of variables</h1> <p>Be careful, the variable <code>variable</code> is out of the scope!</p> <div class="highlight"><pre><span></span><code><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="bp">true</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="k">var</span><span class="w"> </span><span class="n">variable</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;value&quot;</span> <span class="p">}</span> <span class="n">println</span><span class="p">(</span><span class="n">variable</span><span class="p">)</span> </code></pre></div> <h2>More concepts that I need to learn</h2> <ul> <li>The <code>yield</code> instruction.</li> <li>The <code>apply</code> functions.</li> <li>Difference between <code>object</code>, <code>class</code>, <code>case class</code>, and <code>trait</code>.</li> <li><code>Growable</code> and <code>Shrinkable</code> objects.</li> </ul>2019-04-01T00:00:00+02:002019-04-01T00:00:00+02:00Omar Gutiérreztag:None,2019-04-01:/sidney.html

<p>Review and summary of The Parrot's Theorem by Denis Guedj (still incomplete)</p>

<!-- Guedj wrote a joyful novel about the history of Maths, that is, a good introduction to Maths. ## Chapter 1. A Bird in the Hand **Max Liard** rescues a parrot that two fellows were attacking. ## Chapter 2. Seen and Not Seen Mr. Ruche explains how **Thales** was able to realize ## Chapter 3. The Glass Pyramid Mr. Ruche and Albert along with the kids go to the Louvre Museum, specifically, to the Glass Pyramid. --> <p>I am updating this post from time to time.</p> <h2>Chapter 4. The Rainforest Library.</h2> <p>Mr. Ruche receives the crate of books that Grosrouvre sent him. The collection is called the Rainforest Library!</p> <p>Mr. Ruche, Perrette, the twins, and Max discuss together how to classify the "Rainforest Library." They agree to organize the crate of books into the next categories: Geometry, Arithmetic, Algebra, Trigonometry, Probability, Mechanics, Logic, and the New Maths!</p> <p>Max visits a pet shop along with Sidney; he is looking for food for the parrot, there, he sees an official notice stating that to have a pet in France this one needs to have an official certificate. </p> <p>He is told by a girl working there that Sidney is a valuable bird talker, an Amazon blue. The boy has a bad feeling with the girl and quickly gets out of the pet shop. After that, the girl calls someone giving details about Max and Sidney!</p> <h2>Chapter 5. The Three Ages of Math.</h2> <p>Mr. Ruche visits the library for several days, where he studies who were the most important mathematicians and their contributions in different periods of the history.</p> <p>The first day he compiles the list of mathematicians from Ancient Greece, from 700 BC to AD 700. The second day, he continues with the distinguished names in the Arab world, from AD 800 to 1400. And finally, he finishes listing the people of the Western world, from 1500 to 1900.</p> <p>After that, he along with Perrette, start to classify the books in the crates, one by one. And he realizes that, indeed, Grosrouvre was not exaggerating when he said in the letter that was the world's best collection of books about mathematics.</p> <h2>Chapter 6. Friends and Enemies</h2> <p>Mr. Ruche receives an envelope from Brazil that informs him that Grosrouvre was found dead; another letter is inside the pocket, it is directed to him and written by Elgar. </p> <p>Perrette reads the letter to Mr. Ruche. In the letter, Elgar tells him that he solved two theorems and decided to keep them in secret. However, some people with bad intentions was trying to know the solution of those theorems and were behind him. He says goodbye.</p> <p>Mr. Ruche is sad because of his best friend.</p> <p>He, Perrette and the boys (except Lea) discuss the content of the letter, and they try to work out what happened with Elgar.</p> <h2>Chapter 7. The Numbers Game</h2> <p>Mr. Ruche examines the life of Pythagoras and his disciples, the so-called <em>Pythagoreans</em>, such as Hippasus, the leader of the initiated or <em>acousmaticians</em>; Hippocrates, who studied the crescents or lunes and was thrown out of the Pythagorean school; Philolaus, the survivor of the fire provoked by a rejected aspirant, Cylon. Philolaus was an astronomer. Also Archytas, who was an engineer and is reputed to have made a mechanical bird, Archytas also saved Plato from a tyrant called Denys. </p> <p>After reading about Pythagoras, he along with Max and Sidney prepares a lecture to explain to the rest other details about Pythagoras, such as the relationship between musical notes and numbers, the Pythagoras's theorem, and how the initiation was done in his school. </p> <p>The aspirants to be his student were supposed to wait for five years in silence behind a curtain. Those who were waiting to see the master face to face were called <em>exoterics</em>, and the ones who achieved the honor were known as <em>esoterics</em>. </p> <p>Mr. Ruche says to the guys that they are worthy of being esoterics. Mr. Ruche discusses with Perrette about Grosrouvre. She thinks that they should consider the possibility that he is not dead. </p> <p>Finally, and because of Lea was insisting that she was starving, Mr. Ruche suggests to go for an <em>all-nighter</em> and Albert, who was there all the time, wakes up and refuse to be an <em>esoteric</em>.</p> <h2>Chapter 8. Just a Fraction</h2> <p>Mr. Ruche organizes a night school where he discusses the root of number two. </p> <p>Perrette reflects on all the things that are happening since they received the letter. Max is pouring the water from one vase into another, to help Sidney to reach the water in the glass; she quickly realizes that the water will overflow because she sums the ratio of water in each vase, Max gets impressed.</p> <p>Albert tells Max about the knowledge he has acquired of different cities in his profession as a taxi driver, even when he has never been in those cities.</p> <p>The twins together work at the night and proof that there is not a fraction, that, squared, could equal two. Perrette and Mr. Ruche are impressed; he approves his evolution from acousmaticians to mathematicians.</p> <h2>Chapter 9. Night Boat to Alexandria</h2>