I have a third degree equation, with variable a matrix of 256*256. How can I solve it in MATLAB?

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Anshika Goel
Anshika Goel 2017-9-14
评论： Anshika Goel 2017-9-17
I have tried to solve it using fsolve; but it is solving only upto 64*64 matrix. The equation is ax^3+bx^2+cx+d=0; where a,b,c and d are constant matrix of 256*256 size. And x is variable of same size 256*256.
  2 个评论
KSSV
KSSV 2017-9-14
Then you can split your matrix into sub blocks of size 64*64 and solve it..:)
By the way what equation it is? You have to show us the code.
Anshika Goel
Anshika Goel 2017-9-14
编辑：Anshika Goel 2017-9-15
ax^3+bx^2+cx+d=0; where a,b,c and d are constant matrix of 256*256 size. And x is variable of same size 256*256.
By splitting the matrix into sub blocks, the program is taking much time to execute.

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KSSV
KSSV 2017-9-15
Let A,B,C,D be your respective coefficients (Ax^3+Bx^2+Cx+D=0) of size 256*256..
R = zeros(n,n,3) ; % roots initialized
for i = 1:n
for j = 1:n
p = [A(i,j) B(i,j) C(i,j) D(i,j)] ;
r = roots(p) ;
R(i,j,:) = r ;
end
end

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