68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
import { flatten, generalize, identify } from '../../utils/array.js';
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import { factory } from '../../utils/factory.js';
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var name = 'setIntersect';
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var dependencies = ['typed', 'size', 'subset', 'compareNatural', 'Index', 'DenseMatrix'];
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export var createSetIntersect = /* #__PURE__ */factory(name, dependencies, _ref => {
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var {
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typed,
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size,
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subset,
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compareNatural,
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Index,
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DenseMatrix
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} = _ref;
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/**
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* Create the intersection of two (multi)sets.
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* Multi-dimension arrays will be converted to single-dimension arrays before the operation.
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*
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* Syntax:
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*
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* math.setIntersect(set1, set2)
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*
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* Examples:
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*
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* math.setIntersect([1, 2, 3, 4], [3, 4, 5, 6]) // returns [3, 4]
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* math.setIntersect([[1, 2], [3, 4]], [[3, 4], [5, 6]]) // returns [3, 4]
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*
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* See also:
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*
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* setUnion, setDifference
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*
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* @param {Array | Matrix} a1 A (multi)set
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* @param {Array | Matrix} a2 A (multi)set
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* @return {Array | Matrix} The intersection of two (multi)sets
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*/
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return typed(name, {
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'Array | Matrix, Array | Matrix': function ArrayMatrixArrayMatrix(a1, a2) {
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var result;
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if (subset(size(a1), new Index(0)) === 0 || subset(size(a2), new Index(0)) === 0) {
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// of any of them is empty, return empty
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result = [];
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} else {
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var b1 = identify(flatten(Array.isArray(a1) ? a1 : a1.toArray()).sort(compareNatural));
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var b2 = identify(flatten(Array.isArray(a2) ? a2 : a2.toArray()).sort(compareNatural));
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result = [];
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for (var i = 0; i < b1.length; i++) {
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for (var j = 0; j < b2.length; j++) {
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if (compareNatural(b1[i].value, b2[j].value) === 0 && b1[i].identifier === b2[j].identifier) {
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// the identifier is always a decimal int
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result.push(b1[i]);
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break;
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}
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}
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}
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} // return an array, if both inputs were arrays
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if (Array.isArray(a1) && Array.isArray(a2)) {
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return generalize(result);
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} // return a matrix otherwise
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return new DenseMatrix(generalize(result));
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}
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});
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}); |