用Matlab解一个方程组,结果如下,请问怎么回事?是方程组无解吗?S1=-cos(deg2rad(10.11))*41;S2=31.5*cos(deg2rad(10.11))+85*sin(deg2rad(10.11));S3=sin(deg2rad(10.11));S4=-cos(deg2rad(10.11));B1=-12544;B2=-12544*50;B3=12544*22.5;B4=

Question

用Matlab解一个方程组,结果如下,请问怎么回事?是方程组无解吗?
S1= -cos(deg2rad(10.11))*41;
S2= 31.5*cos(deg2rad(10.11))+85*sin(deg2rad(10.11));
S3=sin(deg2rad(10.11));
S4= -cos(deg2rad(10.11));
B1=-12544;
B2=-12544*50;
B3=12544*22.5;
B4=0;
A=[ 1 ,S4 ,-1,0;
0 ,S1 ,-72.5 ,85;
-72.5,S2 ,0 ,0;
0 ,S3 ,0 ,-1];
B=[B1;B2;B3;B4];
x=inv(A)*B;
Warning:Matrix is close to singular or badly scaled.Results may be
inaccurate.RCOND = 1.031673e-19.

Answer 1

他的意思是说A不可逆,得到的答案很可能是错误的
你可以试试看rank(A),你会发现A的秩=3,不是4,所以A根本不可逆