New book on my shelves: "Data Visualization - Principles and Practice"

I have bought the book "Data Visualization: Principles and Practice" in order to improve my knowledge in scientific data visualization

The book has not many reviews on Amazon website. Despite that, they are quite good and the table of contents seems interesting to me.

In particular these are the topics that I find stimulating:

• Vector visualization
• Tensor visualization
• Multivariate data visualization

Unfortunately, neither networks nor graph visualization technique are described in the book. I could find a lot of material on this particular topic (maybe too much) and it will be the subject for my next blog post.

Arduino Tinker Library

I've just started working on my Arduino C++ library. You can find it on GitHub: feel free to download it and use it for your projects.

I'll try to build a modern C++ library with advanced techniques and many examples. I'll suggest you a couple of books by which I am inspired:

• Modern C++ Design: Generic Programming and Design Patterns Applied
• Exceptional C++: 47 Engineering Puzzles, Programming Problems, and Solutions

Log Interface

AbstractLog.h contains an abstract class that you can use in your algorithm class to log every operation.

In SerialLog.h you will find a concrete implementation of AbstractLog which write your algorithm log on the Arduino serial port

In the future I'll show you how to log on a LCD display instead!

Vect3d

Vect3d.h contains a class that represent a 3-dimensional vector. You can use it to do some calculation on a generic 3D space (euclidean space, RGB color space ...)

If you install the Arduino Tinker Library you will find into Arduino IDE an example on how to use Vect3d in your code (File -> Examples -> ArduinoTinkerLibrary -> vect3d)

If you open the Arduino Serial Monitor (Tools -> Serial Monitor or Ctrl+Shift+M) you should see the following output

Vect3d Example
Constructor
V[0;0;0]
V[128;128;128]
V[64;64;64]
V[0.00;0.00;0.00]
V[1.00;1.00;1.00]
V[1.00;1.00;1.00]
V[123.00;456.00;789.00]
Copy
V[64.00;64.00;64.00]
V[1.00;1.00;1.00]
Test
f1 == b2
f3 != b2
Sum
V[124.00;457.00;790.00]
V[124.00;458.00;792.00]
V[129;129;129]
V[130;131;132]
Sub
V[122.00;455.00;788.00]
V[122.00;454.00;786.00]
V[129;130;131]
V[127;127;127]
Scalar Mul
V[307.50;1140.00;1972.50]
V[3.00;3.00;3.00]
Scalar Div
V[49.20;182.40;315.60]
V[1.00;1.00;1.00]
External functions
NormL1(V[1.00;1.00;1.00] - V[64.00;64.00;64.00]): 189.00
NormL2(V[1.00;1.00;1.00] - V[64.00;64.00;64.00]): 13.86
dot(V[1.00;1.00;1.00] - V[64.00;64.00;64.00]): 192.00
cross(V[123.00;456.00;789.00] - V[64.00;64.00;64.00]): V[-21312.00;42624.00;-21312.00]