enhancedmath/lib/Matrix/cofactor.js

This package contains some enhanced mathematical operations

import { getDimensions, getMatrixMinor } from '../Helpers/index';
import determinant from './determinant';
/**
 * Calculates the co-factor matrix of a given matrix
 * @param matrix The matrix
 * @returns The co-factor matrix
 */
const cofactorMatrix = (matrix) => {
    const { rows, cols } = getDimensions(matrix);
    if (rows !== cols) {
        return undefined;
    }
    const cofactor = new Array();
    for (let i = 0; i < rows; i++) {
        const row = new Array();
        for (let j = 0; j < cols; j++) {
            const sign = Math.pow(-1, i + j);
            const minor = getMatrixMinor(matrix, i, j);
            const det = determinant(minor);
            const result = sign * det;
            // TODO: Clean this up
            // eslint-disable-next-line no-compare-neg-zero
            if (result === -0) {
                row.push(0);
            }
            else {
                row.push(result);
            }
        }
        cofactor.push(row);
    }
    return cofactor;
};
export default cofactorMatrix;