How to solve equation AX=B where A is symmetric like matrix ?

Question

Phanindra Reddy Ravi 2021-1-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732128-how-to-solve-equation-ax-b-where-a-is-symmetric-like-matrix

回答： Shubham Rawat 2021-2-3

Consider Ax=B where A is 4x4 and two values of x are known and 2 values of B are known. Then how to find other four unknowns?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

John D'Errico 2021-2-1

Think about how you would solve the problem by hand. You would convert it to a problem wehre you mosve the constant (known) terms to the right hand side. Then you would move the unknowns to the left hand side. Now you would create a NEW matrix that would describe that system, and solve it, using backslash.

Or, you could be lazy, just use solve.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Shubham Rawat 2021-2-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732128-how-to-solve-equation-ax-b-where-a-is-symmetric-like-matrix#answer_613567

在 MATLAB Online 中打开

Hi Phanindra,

You may look use this code for your reference:

syms b1 b2 x1 x2
A = magic(4); %random 4*4 matrix
x = [x1;x2;4;5]; 
b = [6;7;b1;b2];
S = solve(A*x == b); %used solve to solve these equations
% resuls
S.x1 
S.x2
S.b1
S.b2