The question asks to modify the following code.

This question is about using the four-step Adams-Bashforth and Adams-Moulton methods in PECE mode to estimate y(10) for IVP1. (a) Modify the following function so that it performs N steps of the Adams-Bashforth-Moulton combination in PECE mode. function [x, y] = ab4 (x, y, h, N) % The first 3 steps are taken using a four-stage explicit %Runge-Kutta method for i = l: 3 kl = fn(x, y): k2 = fn(x + 0.5 * h, y + 0.5 * h * kl): k3 = fn(x + 0.5 * h, y+ 0.5 *h * k2): k4 = fn(x + h, y + h * k3): y = y + h/6 * (kl + 2 * k2 + 2 * k3 + k4): x = x + h: f(:, i) = kl: end f(:, 4) = fn(x, y): % Now do the rest of the steps using the four-step %Adams Bashforth for i=4: N y = y + h/24*(55*f(:, 4)-59*f(:, 3)+37*f(:, 2)-9*f(:, 1)): x = x + h: f(:, 1) = f(:, 2): f(:, 2) = f(:, 3): f(:, 3) = f(:, 4): f(:, 4) = fn(x, y): end