mat.matrixMap()
const matrix_map = {
/**
* map a matrix (to become another matrix)
* @param {function} f with parameters (value, i, j)
* @example
* const m = [[1, 2], [4, 5]];
* m.matrixMap(x => 2 * x) // [[2,4],[8,10]]
* m.matrixMap((x, i, j) => i === j ? 1 : 0) // [[1,0],[0,1]]
*/
matrixMap(f) {
return this.map((row, i) => row.map((value, j) => f(value, i, j)))
}
};
export default matrix_map;
💈範例:
import matrix_map from '../matrix_map.mjs';
Object.assign(Array.prototype, matrix_map);
const m = [[1, 2], [4, 5]]
m.matrixMap(x => 2 * x) // [ [ 2, 4 ], [ 8, 10 ] ]
m.matrixMap((x, i, j) => i === j ? 1 : 0) // [ [ 1, 0 ], [ 0, 1 ] ]
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