请告诉我以下代码四种方法的迭代次数和误差是多少。以下是修改后的代码，分别实现雅克比迭代、高斯赛德尔迭代、松弛法迭代和多重网格迭代，并画出了误差随迭代次数的变化：

% 二维泊松方程求解方法对比
close all;
clear all;

% 初始化参数
N = 64;
L = 1;
h = L/N;
x = 0:h:L;
y = 0:h:L;
[X, Y] = meshgrid(x, y);
phi_init = zeros(N+1, N+1);
f = 2 * pi^2 * sin(piX) . sin(piY);
tol = 0.001;
max_iter = 1000;

% 使用多种迭代方法求解
method = {‘Jacobi’, ‘Gauss Seidel’, ‘SOR’, ‘Multigrid’};
phi = cell(1, 4);
error_iter = cell(1, 4);
num_iters = zeros(1, 4);

for k = 1:length(method)
    phi{k} = phi_init;
    error_iter{k} = zeros(1, max_iter);
    
    for cnt = 1:max_iter
        switch method{k}
            case ‘Jacobi’
                phi{k} = Jacobi(phi{k}, f, h);
            case ‘Gauss Seidel’
                phi{k} = Gauss_Seidel(phi{k}, f, h);
            case ‘SOR’
                phi{k} = SOR(phi{k}, f, h, 1.5);
            case ‘Multigrid’
                phi{k} = V_Cycle(phi{k}, f, h);
        end
        
        r = residual(phi{k}, f, h);
        error_iter{k}(cnt) = max(max(abs®));
        if error_iter{k}(cnt) < tol
            break;
        end
    end
    
    num_iters(k) = cnt;
    disp([method{k} ’ 迭代次数: ’ num2str(cnt) ’ 误差: ’ num2str(max(max(abs®)) )]);
    
    % 画出迭代过程中的误差变化
    figure(k);
    semilogy(1:cnt, error_iter{k}(1:cnt));
    xlabel(‘迭代次数’);
    ylabel(‘误差’);
    title([method{k} ’ 误差随迭代次数的变化’]);
    grid on;
end

% 画出所有方法迭代过程中的误差变化对比
figure;
colors = ‘rgbk’;
for k = 1:length(method)
    semilogy(1:num_iters(k), error_iter{k}(1:num_iters(k)), colors(k), ‘DisplayName’, method{k}); hold on;
end
xlabel(‘迭代次数’);
ylabel(‘误差’);
title(‘不同方法误差随迭代次数的变化对比’);
legend(‘show’);
grid on;

% 分别定义求解函数：雅克比迭代、高斯赛德尔迭代、松弛法迭代、多重网格
function res = Jacobi(phi, f, h)
    N = length(phi) - 1;
    res = phi;

    for j = 2:N
        for i = 2:N
            res(i, j) = (1/4) * (phi(i+1, j) + phi(i-1, j) + phi(i, j+1) + phi(i, j-1) - h^2 * f(i, j));
        end
    end
end

function res = Gauss_Seidel(phi, f, h)
    N = length(phi) - 1;
    res = phi;
    
    for j = 2:N
        for i = 2:N
            res(i, j) = (1/4) * (res(i-1, j) + phi(i+1, j)  + phi(i, j+1) + res(i, j-1) - h^2 * f(i, j));
        end
    end
end

function res = SOR(phi, f, h, omega)
    N = length(phi) - 1;
    res = phi;
    
    for j = 2:N
        for i = 2:N
            old = res(i, j);
            res(i, j) = (1/4) * (phi(i+1, j) + res(i-1, j) + phi(i, j+1) + res(i, j-1) - h^2 * f(i, j));
            res(i, j) = old * (1 - omega) + omega * res(i, j);
        end
    end
end

function phi = V_Cycle(phi, f, h)
    phi = smoothing(phi, f, h);
    r = residual(phi, f, h);
    rhs = restriction®;
    eps = zeros(size(rhs));

    if length(eps) == 3
        eps = smoothing(eps, rhs, 2 * h);
    else
        eps = V_Cycle(eps, rhs, 2 * h);
    end

    phi = phi + prolongation(eps);
    phi = smoothing(phi, f, h);
end

function res = smoothing(phi, f, h)
    N = length(phi) - 1;
    res = phi;

    for j = 2:N
        for i = 2:N
            res(i, j) = (phi(i+1, j) + res(i-1, j) + phi(i, j+1) + phi(i, j-1) - h^2 * f(i, j)) / 4;
        end
    end
end

function res = residual(phi, f, h)
    N = length(phi) - 1;
    res = zeros(N + 1);

    for j = 2:N
        for i = 2:N
            res(i, j) = f(i, j) - (phi(i+1, j) - 2 * phi(i, j) + phi(i-1, j) + phi(i, j+1) - 2 * phi(i, j) + phi(i, j-1)) / h^2;
        end
    end

end

function res = restriction®
    N = (length® - 1) / 2;
    res = zeros(N + 1);

    for j = 2:N
        for i = 2:N
            res(i, j) = (r(2i-2, 2j) + 2 * r(2i-1, 2j) + r(2i, 2*j)) / 4;
        end
    end
end

function res = prolongation(eps)
    N = (length(eps) - 1) * 2;
    res = zeros(N + 1);

    for j = 2:2:N
        for i = 2:2:N
            res(i, j) = (eps(i/2, j/2) + eps(i/2+1, j/2) + eps(i/2, j/2+1) + eps(i/2+1, j/2+1)) / 4;
        end
    end

    for j = 1:2:N+1
        for i = 1:2:N+1
            res(i, j) = eps((i+1)/2, (j+1)/2);
        end
    end
  for j = 2:2:N
        for i = 1:2:N
            res(i, j) = (eps((i+1)/2, j/2+1) + eps((i+1)/2, j/2)) / 2;
        end
    end
    
    for j = 1:2:N
        for i = 2:2:N
            res(i, j) = (eps(i/2+1, (j+1)/2) + eps(i/2, (j+1)/2)) / 2;
        end
    end
end