Maths / Computing ...

Une petite synthése sur le codage informatique des nombres, des formats utilisés ainsi que des conséquences du point de vue précision, algorytmique ....

This article is about numerical precision, algorithm choice and  optimisation. The whole on the existential question of the best method of computing  sin or cos function.

After writing a few lines of program, you probably faced with source codes containing small words difficult to understand. The few lines of this article discuss some useful aspects of these C and C++ identifiers/modifiers.

The C, C++: new, delete malloc and free commands use often complicated memory management mechanisms. A misuse of this management very often leads to the unexplained "crash" of a program. In this article, we will try to get a clearer view of this management as well as the management of Objects managed automatically or not by the compiler. You will find attached to this article a library (also available for download in the arduino download area) allowing you to experiment and may be more clear about it.

This article describes how to make a compiler of simple mathematical expressions using a computer grammar. It provides an overview of the tools used in such an operation. A fully executable version to compile for an arduino mega (written in C++) allows to understand the link between theory and practice. Finally it can be a good starting point for many improvements.

We are fed with curves, figures derived from sampled data often with a small asterisk (average of the sliding window). In the same way, on our mobile phones, we listen to averaged sampled sounds... In this article, we will try to demystify this asterisk and discuss under different aspects of sliding averages, their uses, the manipulations, as well as the programming of these averages. 

This article proposes to explain without mathematical excesses what the Fourier transform is. It also approaches the "numerical calculation" aspect of this transform with a comparison of two calculation algorithms. Finally, in a C++ application designed for an arduino, it proposes an almost "real time" view-meter of the transform of a sound.

Who hasn't complained one day or another when trying to do a mailing and finding that the damn W... removes a '0' character or displays a date in the EU method or ...
When faced with adversity, don't give up! In this article you will find how to get your data printed the way you want it and maybe (probably!) some presentation options that the average person and many others don't know about. The information in this article has been gleaned from the web, tried and tested.
I hope that this information will prevent some thunderous swearing from spreading into the wild.
Translated with www.DeepL.com/Translator (free version)

A little article that sounds more mathematical than computer-related, although it is!
In this article (which is in fact the explanation of the method used in the POUTRE software of the same author, which you will find in the mechanics download page of this site), we discuss of a little-known method of calculation in mechanics and especially of the use of homogeneous matrices.

Matrice ! Matrice ! Est-Ce Que J'ai Une Gueule De Matrice ?At the beginning it was supposed to be a few lines of clarification on these objects that we often meet in computer science.  Over the hours, this article has grown to cover the most commonly used mathematical notions about matrices, different methods of solving linear systems coordinate changes in mechanics and an overview of homogeneous systems. 

The downloaded file contains an article on the different types of magnetic field detection sensor. It looks at how to build an electronic compass using these sensors. Feel free to use, modify or, in a word, abuse them.