function nrows nrows(x: array | matrix): number Returns the number of rows in an array or matrix. Returns the number of rows in a 1D array (treated as a row vector) or a 2D matrix. Examples Row vector (1D array) import { assertEquals } from "jsr:@std/assert"; assertEquals(nrows([5, 6, 7]), 1); Matrix with multiple rows (2D array) import { assertEquals } from "jsr:@std/assert"; assertEquals(nrows([[3, 2, 7], [4, 5, 6]]), 2); Parameters x: array | matrix Array or matrix of elements. Return Type number The number of rows in the input. Throws Throws an error if no input is provided or if the input is not an array.