import type { matrix } from "../types";
/**
 * Flip a matrix upside down.
 *
 * Reverses the order of the rows in the input matrix, flipping it upside down.
 *
 * @param x The input array or matrix
 * @returns The matrix with its rows flipped upside down
 * @throws If no input is provided or input is invalid
 *
 * @example Flip a 2D matrix upside down
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(flipud([[1, 4], [2, 5], [3, 6]]), [[3, 2, 1], [6, 5, 4]]);
 *
 * ```
 *
 * @example Flip a single number (should return the number itself)
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(flipud(5), 5);
 *
 * ```
 *
 * @example Flip a simple 2D matrix
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(flipud([[1, 2], [3, 4]]), [[3, 1], [4, 2]]);
 * ```
 */
export default function flipud(x: number | matrix): number | matrix;
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