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#variables

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@janhoglund

Nothing is perfect. The #system (and consequently the #model built upon it) is always a selected subset of all the #variables available for the #control of the #machine.

#WR_Ashby in “Design for a Brain” (chapter 2/5) explains in more detail the meaning of the word “system”:

Because any real ‘machine’ has an infinity of variables, from which different observers (with different aims) may reasonably make an infinity of different selections, there must first be given an observer (or experimenter); a system is then defined as any set of variables that he selects from those available on the real ‘machine’. It is thus a list, nominated by the observer, and is quite different in nature from the real ‘machine’. Throughout the book, ‘the system’ will always refer to this abstraction, not to the real material ‘machine’.

As you can never control all the variables of any given “machine”, there is always the possibility that the variables that you don’t control will generate some unforeseen consequences.

1️⃣ Kihbernetic #System with
2️⃣ fundamental #Processes: a recursive #Autopoietic self-production for growth and learning, and a linear #Allopoietic production of “other things”, such as behavior and waste, distributed in
3️⃣ Control #Levels, of #Regulation, immersed in, and dealing with things in the system’s environment, #Control for managing the workload of different regulators, and #Guidance to provide long-term goals and preserve the identity of the system, all using
4️⃣ #Variables: sensory #Input of data and other resources, motor #Output of behavior, #Information as the difference that will make a difference in the subsequent (updated) #Knowledge state, all interconnecting
5️⃣ #Functions: the #Control-ed #Reaction to external stimuli, the #Perception of sensory states, the #Prediction of the expected outcome of past behavior, and the repeated #Integration of new information into an updated knowledge state.

The options `--variable` and `--metadata` are related and do similar things, but they differ in important aspects:
1. #Metadata values are made available to filters and are considered part of the document, while #variables are relevant only for the final rendering step.
2. The values of variables are inserted verbatim in the output, while metadata is escaped. Compare the HTML output of
pandoc --variable pagetitle='<b>x</b>' -s
to
pandoc --metadata pagetitle='<b>x</b>' -s

Variables in Python: High Level Concepts with Easy Examples, applicable to most other Languages too

In Python (and any language that stores variables), a variable is a reserved memory location that stores a value. They are names that can be assigned a value and used to reference it throughout your code. Using a variable makes a value accessible & gives valu ...continues

See gadgeteer.co.za/variables-in-p