Showing content from https://drafts.csswg.org/css-color/multiply-matrices.js below:
/** * Simple matrix (and vector) multiplication * Warning: No error handling for incompatible dimensions! * @author Lea Verou 2020 MIT License */ // A is m x n. B is n x p. product is m x p. function multiplyMatrices(A, B) { let m = A.length; if (!Array.isArray(A[0])) { // A is vector, convert to [[a, b, c, ...]] A = [A]; } if (!Array.isArray(B[0])) { // B is vector, convert to [[a], [b], [c], ...]] B = B.map(x => [x]); } let p = B[0].length; let B_cols = B[0].map((_, i) => B.map(x => x[i])); // transpose B let product = A.map(row => B_cols.map(col => { if (!Array.isArray(row)) { return col.reduce((a, c) => a + c * row, 0); } return row.reduce((a, c, i) => a + c * (col[i] || 0), 0); })); if (m === 1) { product = product[0]; // Avoid [[a, b, c, ...]] } if (p === 1) { return product.map(x => x[0]); // Avoid [[a], [b], [c], ...]] } return product; }
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