clc,clear,close all
A = [1 2 -2
1 1 1
2 2 1];
b = [-15
20
-25];
D = diag(diag(A)); % 对角线矩阵
U = -triu(A,1); % 上三角矩阵
L = -tril(A,-1); % 下三角矩阵
B = inv(D)*(L+U);
rho = max(eig(B));
if rho<1
disp(['该方程的雅克比迭代法的迭代矩阵的谱半径等于 ',num2str(rho),'<1'])
disp('因此')
disp('该方程组的雅克比迭代法关于任意初始向量收敛')
else
disp(['该方程的雅克比迭代法的迭代矩阵的谱半径等于 ',num2str(rho),'>1'])
disp('因此')
disp('该方程组的雅克比迭代法不是关于任意初始向量收敛')
end
B = inv(D-L)*U;
rho = max(eig(B));
if rho<1
disp(['该方程的高斯——赛德尔迭代法的迭代矩阵的谱半径等于 ',num2str(rho),'<1'])
disp('因此')
disp('该方程组的高斯——赛德尔迭代法关于任意初始向量收敛')
else
disp(['该方程的高斯——赛德尔迭代法的迭代矩阵的谱半径等于 ',num2str(rho),'>1'])
disp('因此')
disp('该方程组的高斯——赛德尔迭代法不是关于任意初始向量收敛')
end
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