It has occurred to me that, although I am very interested in Computer Science, I do not have many posts on that topic. This post is nothing complicated; it could be read as a one answer for non-programmers: what’s so interesting about CS? If you find it interesting, maybe CS is for you.
Many times on this website, I have referred to “recursion,” but I have not defined what it means. In essence, recursion means that an element of a process causes the process itself. In other words, a recursive system is one that is self-perpetuating.
To demonstrate recursion, I wrote the following simple program in Scheme-based language Racket :
That’s all there is to it. To explain what this program does, I think it is best to show it pictorially, using an analogy of a line:
Imagine we start with one line segment. Now, the line segment can do any one of two things.
First, the line can end:
I will call the red X an “end node.” This line segment does nothing else.
The second thing the line can do is split:
The line has divided into two separate segments. Each green question mark represents an instance of recursion. What that means is the process repeats again with respect to both of the newly-created line segments. Now, the segments can both end, or both split again, or one can split while the other ends.
I will now return to my code. Here is the text:
(define (r n)
(if (< (random 2) 1) ;;Flip a coin. If you get heads:
(cons (r 0) (r 0)) ;;split.
‘())) ;;Otherwise, end.
Of course, the text after the semicolons are notes, and do not effect the program.
Imagine that the program starts with a line. The program is written so that there is a 50% chance the line splits. Another 50% chance the line ends.
If the line splits, the program is run again with respect to every newly-created line segment. This process continues until every line segment in the data structure has ended.
1/2 of the time, the line ends immediately:
Of those that split, 1/4 of those then immediately end:
Do not worry about the console output. I only give it to you so that you can compare their relative sizes.
[If you must know, ‘() ostensibly means “empty”, and represents an end node. The word “list” indicates a specific instance of recursion that occurred. With that said, if you want to get a bit technical, the console output is a bit abbreviated. Some end nodes or instances of recursion are only implied. For instance, (list ‘()) only displays one ‘() while there should be two; it is actually an abbreviation of (cons ‘() ‘())].
I will call a bunch of connected lines a “structure”. So far, I have only showed you simple structures. Sometimes, the program creates more complicated structures:
So what’s happened here? Recursion has occurred many times. Each line strand continued until it ended.
If we arbitrarily choose to measure the size of a structure by its number of end nodes, this structure is 6 end nodes (red Xs) large.
You may notice that it is possible to execute this program with a simple pencil, paper, and a coin. Draw a line on the paper. Then flip a coin. If the coin is heads, split the segment. If it is tails, end the segment. Repeat for any and every newly created segment.
I would like to take a brief interlude to wax about the implications recursion. The term is usually specific to computer science, but in a broader sense, I posit that an animal (or any living thing) could be labeled “recursive” because it is capable of reproduction. A tiger can either die before reproducing, or have any number of children. The process repeats for those children.
In many ways, this post of mine annoys me; I’m not so confident in the premise of its second half. However, it’s value is in how it explains the genetic nature of certain processes: companies, ideas, words, and so on. I call these “genetic patterns”, but for a moment I considered calling them “recursive systems”. The simple piece of code I wrote, by demonstrating the nature of recursion, shows something generalizable to any number of self-replicating processes.
Back to the program.
I wrote a separate piece of code that runs my program 100 times and records the size of each of the created structures. I then graphed out the results:
Each dot on this graph represents a time the program was run. The dots are sorted by the number of end nodes created.
Clearly evident here are some “outliers”. These are what Nassim Nicholas Taleb would call “black swans “.
Remember that a half of structures are only of size ONE. Most structures are in the single digits. Because of black swans, though, (and I recommend viewing this on a larger device), some single structures give you a console output like this:
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Published
December 5, 2018 December 21, 2018
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