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Add clusteredCellsDensity function to extramath.js

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Introduces clusteredCellsDensity to evaluate density of selected cells within a grid. Updates module version to 1.0.0 and exports the new function for external use.
This commit is contained in:
Namhyeon Go 2025-08-18 04:16:52 +09:00
parent 83fb136957
commit 717b141cb7
1 changed files with 28 additions and 1 deletions
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29
lib/extramath.js
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@ -70,13 +70,40 @@ function cartesianProduct(arr) {
}, [[]])
}
function clusteredCellsDensity(numbers, size, minDensity) {
if (!numbers || !numbers.length) return false;
if (typeof minDensity === 'undefined') minDensity = 0.6;
if (typeof size !== 'number' || size <= 0) size = 4; // default grid size = 4
// 1. Convert cell number → (x,y) coordinates
var coords = numbers.map(function (n) {
return { x: n % size, y: Math.floor(n / size) };
});
var xs = coords.map(function (c) { return c.x; });
var ys = coords.map(function (c) { return c.y; });
// 2. Compute bounding box of selected cells
var minX = Math.min.apply(Math, xs), maxX = Math.max.apply(Math, xs);
var minY = Math.min.apply(Math, ys), maxY = Math.max.apply(Math, ys);
// 3. Compute area and density
var w = maxX - minX + 1;
var h = maxY - minY + 1;
var boxArea = w * h;
var density = coords.length / boxArea;
return density >= minDensity;
}
exports.DTM = DTM;
exports.arrayCos = arrayCos;
exports.measureSimilarity = measureSimilarity;
exports.export_measureSimilarity = export_measureSimilarity;
exports.cartesianProduct = cartesianProduct;
exports.clusteredCellsDensity = clusteredCellsDensity;
exports.VERSIONINFO = "ExtraMath module (extramath.js) version 0.0.5";
exports.VERSIONINFO = "ExtraMath module (extramath.js) version 1.0.0";
exports.AUTHOR = "gnh1201@catswords.re.kr";
exports.global = global;
exports.require = global.require;