import type { array, matrix } from "../types";
/**
 * Set a row of a matrix.
 *
 * Replaces the values of row `n` in a matrix with a given row vector.
 *
 * @param x Row vector (1xN) to insert.
 * @param mat Matrix (MxN) in which to set the row.
 * @param n Row index (0-based).
 * @returns A new matrix with the updated row.
 * @throws When the row index is out of bounds or the vector length mismatches the number of columns.
 *
 * @example Replace the first row of a matrix
 * ```ts
 * import { assertEquals, assertThrows } from "jsr:@std/assert";
 *
 * assertEquals(setrow([2, 0, -2], [[5, 6, 5], [7, 8, -1]], 0), [
 *   [2, 0, -2],
 *   [7, 8, -1]
 * ]);
 *
 * ```
 *
 * @example Replace the second row of a matrix
 * ```ts
 * import { assertEquals, assertThrows } from "jsr:@std/assert";
 *
 * assertEquals(setrow([9, 21, 57], [[5, 6, 5], [7, 8, -1]], 1), [
 *   [5, 6, 5],
 *   [9, 21, 57]
 * ]);
 *
 * ```
 *
 * @example Row vector length mismatch error
 * ```ts
 * import { assertEquals, assertThrows } from "jsr:@std/assert";
 *
 * assertThrows(() => setrow([1, 2], [[4, 5, 6], [7, 8, 9]], 1), "Row vector length must match the number of matrix columns.");
 *
 * ```
 *
 * @example Row index out of bounds error
 * ```ts
 * import { assertEquals, assertThrows } from "jsr:@std/assert";
 *
 * assertThrows(() => setrow([1, 2, 3], [[4, 5, 6], [7, 8, 9]], 2), "Row index must be an integer between 0 and M-1.");
 * ```
 */
export default function setrow(x: array, mat: matrix, n: number): matrix;
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