2019-12-23 11:27
In some engineering applications, be it electrical energy transmission, distribution or even in the simple case of use of electrical energy, copper busbars are used in place of cables.Typica… Read More
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The Beginner Programmer Blog
firsttimeprogrammer.blogspot.com
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shaded pole motor
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A blog about Statistics, Data Science and Machine Learning experiments using Python, R and Java.
On occasion Finance, Electrical circuits and Arduino
2019-10-19 22:15
For a long time I wanted to simulate the electric and magnetic quantities in a shaded pole motor and last week I finally found 10 minutes to dedicate to this activity. I find these motors fa… Read More
2018-08-16 12:10
This post is a follow up of this project.After a lot of fiddling around, I finally built up the circuit for automating the turn on and off of my garden lights. It was about time wasn’i… Read More
2018-08-16 12:00
Linear programming is a technique to solve optimization problems whose constraints and outcome are represented by linear relationships.Simply put, linear programming allows to solve problems… Read More
2018-08-14 19:15
This is a short post following the previous one (PCA revisited).In this post I’m going to apply PCA to a toy problem: the classification of faces. Again I’ll be working on the Ol… Read More
2018-08-13 15:38
Principal component analysis (PCA) is a dimensionality reduction technique which might come handy when building a predictive model or in the exploratory phase of your data analysis. It is of… Read More
2018-08-11 22:17
This week I finally got to play around a little with some electronic components I ordered and test them before using them on side projects. My goal was to find the IV curve of a 3V 0.5W zene… Read More
2018-03-04 12:03
When you learn about the Fourier transform and what it can show you about a signal, you immediately start thinking about its possible applications. The Fourier transform, however, deals with… Read More
2017-09-18 19:43
One of the perks of knowing a programming language is that you can build your own tools and applications. Depending on what you need, it may even be a fast process since you usually do not n… Read More
2017-09-03 21:41
FEMM stands for Finite Element Method Magnetics, and it is a nice software for solving magnetics and electrostatics problems.I’ve known FEMM for at least a couple of years but I’… Read More
2017-09-03 21:31
Recently I’ve been getting familiar with AutoCAD and at the same time I’m trying to improve my Python skills. Odd mix, huh?!While trying to improve my Python skills I thought I c… Read More
2017-09-02 21:59
Recently I had a brilliant idea :D why not make a rotating magnetic field that can rotate a needle of a compass? (or any other magnetic needle for that matter).Ok but the design must be very… Read More
2017-09-02 20:42
Finding analytical solutions to physical problems is always nice and rewarding, however it can be a bit of a pain when the geometry of the problem (just to mention one possible hustle) becom… Read More
2017-09-02 17:42
FEMM stands for Finite Element Method Magnetics, and it is a nice software for solving magnetics and electrostatics problems.I’ve known FEMM for at least a couple of years but I’… Read More
2017-08-30 23:44
Balancing a ball on a beam is not a common problem you may face during your everyday life, however, this simple example of engineering can be extended to more complex problems and, in genera… Read More
2017-08-30 20:45
Electrically speaking, a permanent magnet DC motor can be modelled as follows:applying LKT we obtain the following differential equation$$v = Ri+L\frac{di}{dt}+e$$where $R$ is the equivalent… Read More
2017-08-04 17:36
More than 2 years ago I wrote a short post on Taylor series. The post featured a simple script that took a single variable function (a sine in the example), printed out the Taylor expansion… Read More
2017-05-19 18:59
Some time ago I wrote a short article on a small circuit I made to power on and off my garden lights using only a handful of components and some patience. Since then, however, I’ve dug… Read More
2017-05-02 09:30
I’ve learnt a few things the hard way while messing around with electronic circuits, here is a basic summary: 1. When designing a circuit for a basic task, keep it SIMPLE! The less co… Read More
2017-03-05 08:37
Here I am after a short break, writing again about R!In december I worked on a project that required me to work on spatial data. This led me to learn about how R deals with this kind of data… Read More
2016-11-30 12:48
Short circuits are one of the most common failures that can happen when dealing with electrical circuits. Short circuits can be accidental, think of a tree branch leaning onto a high volta… Read More
2016-11-30 10:52
Electrical transmission systems are something we all take for granted. They work in a reliable manner ensuring high quality of service and as few minutes lost per year as possible. Low volt… Read More
2016-10-25 23:11
On 27th of October I’m going to attend the 7th MilanoR meeting featuring the following two talks: 1. Interactive big data analysis with R: SparkR and MongoDB: a friendly walkthrough&nb&hell…Read More
2016-09-24 08:35
After having carefully followed the online official Shiny tutorial, I decided to make a quick try at making my very first Shiny App. I should say that I found myself very well with the expla… Read More
2016-09-13 11:33
Recently, a friend went skydiving and, me being me, the first thing I could think about was making some physical considerations on his adventure :) If you think of a falling object, at first… Read More
2016-09-12 21:20
Yesterday I found an “old” script I wrote during a morning in the last semester. I remember being a little bored and interested in the concept of Q-learning. That was about the t… Read More
2016-09-11 16:42
I’ve been experimenting for more than two months with Tensorflow, and while I find it a bit more “low level” if compared to other libraries for machine learning, I like it… Read More
2016-08-05 21:39
This is a detailed tutorial on image recognition in R using a deep convolutional neural network provided by the MXNet package. After a short post I wrote some times ago I received a lot of r… Read More
2016-08-05 14:56
While continuing my study of neural networks and deep learning, I inevitably meet up with recurrent neural networks. Recurrent neural networks (RNN) are a particular kind of neural networks… Read More
2016-07-25 12:58
Among R deep learning packages, MXNet is my favourite one. Why you may ask? Well I can’t really say why this time. It feels relatively simple, maybe because at first sight its workflow… Read More
![Fluid Dynamics: Pressure Drop Modelling [heavily Revised]](https://cdn.blogarama.com/images/posts_thumbs_site_id/3000/300019-3750370337.w320.jpg "Fluid Dynamics: Pressure Drop Modelling [heavily Revised]")
2016-07-23 23:37
Some time ago I uploaded a short script on modelling pressure drop in a circular diameter pipe. While at the time I felt I did a good job, I knew there sure was room for improvement. After h… Read More
![How To Fit A Copula Model In R [heavily Revised]. Part 2: Fitting The Copula](https://cdn.blogarama.com/images/posts_thumbs/2859/2859497.w320.jpg "How To Fit A Copula Model In R [heavily Revised]. Part 2: Fitting The Copula")
2016-03-29 09:51
Here I am again with part 2. If you would like to read part 1 of this short tutorial on copulas, please click here. In this second post I am going to select a copula model, fit it to a test… Read More
2016-03-13 17:01
More than a year ago I wrote a short post on how to fit a copula model in R. The post showed how to make a very raw and basic fitting of a test dataset to a two dimensional normal copula (or… Read More
2016-02-15 16:36
Control system theory is very useful when it comes to simulate physical systems and their behaviour.Suppose you have a mass attached to a spring on an horizontal flat surface. The force diag… Read More
2016-02-14 18:48
Mutual inductors can be a lot of fun, and sometimes a bit of an headache if you mess something up or represent them in a complicated way. Take for instance the following circuit designed wit… Read More
2015-12-22 13:45
Today I am going to make a brief description of the step response of a RLC series circuit. This is the schematic made with LTspice As you can see the components used are a resistor, an indu… Read More
2015-12-21 20:37
A symmetric, three-phase and perfectly balanced system can be easily modelled either by pen and paper with the use of phasors or using LTspice which is faster. In case you would like to try… Read More
2015-12-08 14:10
Here I am again after a long break! During my last engineering class I learnt about the frequency response of a system and how this thing can be applied to solve simple problems. But the cr… Read More
2015-09-28 14:17
Recently I wrote a post for DataScience+ (which by the way is a great website for learning about R) explaining how to fit a neural network in R using the neuralnet package, however I glossed… Read More
2015-09-15 21:47
Now that we fitted the classifier and run some preliminary tests, in order to get a grasp at how our model is doing when predicting creditability we need to run some cross validation methods… Read More
2015-09-02 15:05
As I said in the previous post, this summer I’ve been learning some of the most popular machine learning algorithms and trying to apply what I’ve learned to real world scenarios… Read More
2015-09-02 08:59
Yep! I finally made it! I’m on GitHub and you can find me and some of my sideprojects at: www.github.com/mick001 As you’ll see, I moved to GitHub only the projects I’ll be… Read More
2015-08-24 20:13
Since the beginning of this summer I have been practicing a lot with Scikit-learn to improve my knowledge of Machine Learning both on theory and practice. Last week I also tried to tackle so… Read More
2015-08-20 22:12
As a sideproject I decided to design a simple experiment and use Arduino to measure the friction coefficient of an object sliding on a given material. Ideally we would like our first object… Read More
2015-08-20 12:32
Please make sure to read the disclaimer at the bottom of the page before continuing reading. Plain vanilla call and put european options are one of the simplest financial derivatives existin… Read More
2015-08-20 11:10
At the beginning of this summer, I was asked to provide a simple (and possibly cost-effective) solution to a simple problem: how can I do in order for my garden LED lights to turn themselves… Read More
2015-08-14 19:59
A hidden Markov model is a statistical model which builds upon the concept of a Markov chain. The idea behind the model is simple: imagine your system can be modeled as a Markov chain and th… Read More
2015-08-01 13:23
Linear regression models are one the simplest and yet a very powerful models you can use in R to fit observed data and try to predict quantitative phenomena. Say you know that a certain var… Read More
2015-07-30 18:03
Since the first time I was taught the Poisson and Exponential distributions I have been wondering how to apply them to model a real world scenario such as arrivals of people in a shop. Last… Read More
2015-07-27 19:25
Last semester I attended a course in complex analysis and I was introduced to the basics tool used in this field. I was fascinated by almost anything that I was taught and although some topi… Read More
2015-07-26 12:19
While writing the scripts for the past articles I thought it might be fun to implement the 3D version of the heat and wave equations.As for the wave equation, Wolfram has a great page which… Read More
2015-07-19 22:35
Imagine you have an ideal string of length L and would like to find an equation that describes the oscillation of the string. Assuming the string is fixed at its ends and starts its motion i… Read More
2015-07-18 14:21
RC and RL are one of the most basics examples of electric circuits and yet they are very rich in content. Let’s examine each one carefully Here is the schematics of an RL circuit The… Read More
2015-07-16 21:09
Apparently, it looks like I’m all focused on PDEs at this time of the year. There’s a good reason though! I find PDEs extremely fascinating in that they allow you to model comple… Read More
2015-07-15 23:32
While writing the code for the previous post I slightly modified the code in order to add 2 ‘peaks of heat’. Now, by looking at what I wrote I am not quite sure that the solution… Read More
2015-07-15 22:18
By making some assumptions, I am going to simulate the flow of heat through an ideal rod. Suppose you have a cylindrical rod whose ends are maintained at a fixed temperature and is heated at… Read More
2015-07-11 13:56
Say we have some data and we are pretty confident that it comes from a random variable which follows a Normal distribution, now we would like to estimate the parameters of that distribution… Read More
2015-07-11 13:36
Now then, in the previous article I wrote about hypothesis testing with data that is normally distributed, in this article I’m going to post some quick test you can do to check if it i… Read More
2015-07-11 10:20
Hypothesis testing is a useful statistical tool that can be used to draw a conclusion about the population from a sample. Say for instance that you are interested in knowing if the average v… Read More
2015-05-20 21:45
Magnetism and magnetism related phenomena are fascinating almost for everyone, in fact, I remember being a intrigued by the interaction between magnets since I was a little kid. On the other… Read More
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