function x=gaussMethod(A,b)%高斯列主元消去法,要求系数矩阵非奇异的, %n = size(A,1);if abs(det(A))<= 1e-8
error('系数矩阵是奇异的');
return;end%for k=1:n
ak = max(abs(A(k:n,k)));
index = find(A(:,k)==ak);
if length(index) == 0
index = find(A(:,k)==-ak);
end
%交换列主元
temp = A(i...