Matlab解线性方程组的几种常见方法2页.doc

Matlab求解线性方程组Ax=b的几种常见方法例如方程组：法1：左除法 A=3 1 -1;1 2 4;-1 4 5;b=3.6;2.1;-1.4; x=Abx = 1.4818 -0.46060.3848法2：求逆法 A=3 1 -1;1 2 4;-1 4 5;b=3.6;2.1;-1.4; x=inv(A)*bx = 1.4818 -0.46060.3848法3：用linsolve函数求解 A=3 1 -1;1 2 4;-1 4 5;b=3.6;2.1;-1.4; x=linsolve(A,b)x = 1.4818 -0.46060.3848法4：用solve函数求解 x1 x2 x3=solve(3*x1+x2-x3=3.6,x1+2*x2+4*x3=2.1,-x1+4*x2+5*x3=-1.4) x1 = 1.4818