```js export const getMeanAsRowVector = (matrix) => { const n = getDimensionSize(matrix, 2); const vectors = Array(n).fill().map((_, i) => math.eval(`matrix[:, ${i + 1}]`, { matrix })); return vectors.reduce((result, vector) => result.concat(math.mean(vector)), []); }; ``` Seem obvious here that `getDimensionSize` is calling from nowhere?