Dear xhxchina,
I will try to help. But can you please explain me about what you mean by "x is bounded".
line equations Ax=b,where A is an m*n matrix, x is an n*1 matrix, b is an m*1matrix ,m<n. Each element in A,x,b is real . I want to know under what condition the x is bounded , which is also mean each element in x is lower than a real positive number and larger than 0.
A and b isn't variables, they are specific.
line equations Ax=b,where A is an m*n matrix, x is an n*1 matrix, b is an m*1matrix ,m<n, Rank(A)=m. Each element in A,b is real,so A and b is specific . the equations has infinite solutions x,
Then I want to know under what condition the x is bounded.