lyagushka

(Russian лягушка [lʲɪˈɡuʂkə]: frog)

Lyagushka is a Rust command-line tool inspired by Fatum Project's 'Zhaba' algorithm (Russian 'жаба': toad) and expands upon it for more versatility.

It is an algorithm that analyzes a one-dimensional dataset of integers to identify clusters of closely grouped "attractor" points and significant "void" gaps between these clusters. It calculates z-scores for each cluster or gap to measure their statistical significance relative to the dataset's mean density and distance between points. The analysis results, including attractors, voids, and their z-scores, are output as a JSON string.

Building

$ cargo build

Usage

Parameters

• filename.txt (optional): A file containing a newline-separated list of integers to analyze. If not provided, the program expects input from stdin.
• factor: A floating-point value by which the mean density/span is multiplied to make up a threshold for attractor and void detection.
• min_cluster_size: An integer specifying the minimum number of contiguous points required to be considered a cluster.

Output

The tool outputs a JSON string that includes details about the identified attractors and voids, along with their respective z-scores. Here's an example of the JSON output format:

[
  ...
  {
        "elements": [ 722, 722, 722, 725, 725, 726, 726, 726],
        "start": 722,
        "end": 726,
        "span_length": 4,
        "num_elements": 8,
        "centroid": 724.0,
        "z_score": 1.19528
    },
    {
        "elements": [],
        "start": 732,
        "end": 740,
        "span_length": 8,
        "num_elements": 0,
        "centroid": 736.0,
        "z_score": -1.13359
    },
    ...
]

From a File

To analyze a dataset from a file, provide the filename as an argument, followed by the factor and minimum cluster size parameters

lyagushka filename.txt 1.5 6

(= 'Attractor clusters need to have at least 6 numbers with 1.5 times the mean density, void gaps need to be at leat 1.5 times the mean gap size wide')

From Stdin

Alternatively, you can pipe a list of integers into the tool, followed by the factor and minimum cluster size.

echo "1\n2\n10\n20" | lyagushka 0.5 2