## Fuzzy logic against PID. We cross a hedgehog and a snake. Aircraft engine and control algorithms for nuclear power plants

3r3-31. 3r38080. Probably, everyone who studied the theory of automatic control often had doubts about how these two, three or even ten squares of transfer functions in a model represent the dynamics of a complex unit, such as a nuclear reactor or an aircraft engine. Is there no cheating here? It is possible that working with simple models will cease to work with complex models in "real" life.
3r3678.
3r38080. In this article, we will experiment with the “real” model of an aircraft engine. Having weighed it with “real” models of equipment and control algorithms from a nuclear power plant.
3r3678...
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## MatLab /Octave machine learning: examples of algorithms supported by formulas

3r395. 3r3-31.
3r3384. 3r375.  3r395.
I recently started learning machine learning. I started with the beautiful, in my opinion, course by Andrew Ng. And in order not to forget, as well as repeat the learned, I decided to create a repository of 3r310. Machine Learning in Octave
. In it, I collected mathematical formulas for hypotheses, gradient descents, "cost function", sigmoids and other fundamental "machine" for machine learning. Also added there are simplified and refined examples of the implementation of some popular algorithms (neural network, linear /logistic regression, etc.) for MatLab /Octave...
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## Data-driven decision on an example of a choice of color for painting walls

Starting to choose a color for painting the walls in the room, I came across an interesting thing. The entire process from the very beginning began to resemble work on some IT-ML-Blah-blah-blah-analytical project.

There is also a customer who does not really understand what exactly he wants, but he wants everything to be good and he liked it. There are still several interested parties on the part of the customer who can not agree on what is "good". There are some re-statements of the problem, which, under a big question, are relevant to this very "good", but at least somehow solvable. There ...
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## Descriptor graphics in MATLAB: second horizontal axis

When studying the descriptor graphics in MATLAB, there was a shortage of "userfriends" of the functional, namely the absence of a standard command allowing to add an additional horizontal axis.

Adding an additional vertical axis, using the command. plotyy provided and in help to it, in the topics section, there is an example of adding an additional axis x , but this example, like the team itself, is not without flaws, which the developer himself graciously tells us:
plotyy is not recommended
the description of the command axes ;

...
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