taking the inverse of multiple matrix's

sigma is a 28x28x10 matrix, or 10 28x28 matrix's. I'd like to get the iverse of each of those matrix's and store them in mean_inverse, but it is saying "Warning: Matrix is singular to working precision. " What am I doing wrong?

[Paul]

Not that it will address this issue, but you may be interested in pageinv

Answer 1

[Torsten]

What am I doing wrong?

Nothing. But some or all of the sigma matrices that you try to invert seem to be singular.

[Walter Roberson]

There are, however, arguments to be made that in practice using inv() is most often a mistake, that there are very often mathematically better methods that do not involve explicit calculation of the inverse of a matrix.

Answer 2

[Harshvardhan]

% Define the matrices
A = [1 2; 3 4];
B = [5 6; 7 8];
C = [9 10; 11 12];

% Create a cell array of the matrices
matrices = {A, B, C};

% Loop through the matrices and calculate their inverses
for i = 1:length(matrices)
    inv_matrices{i} = inv(matrices{i});
end

% Display the inverse matrices
for i = 1:length(inv_matrices)
    disp(['Inverse of matrix ', num2str(i), ':']);
    disp(inv_matrices{i});
end

Inverse of matrix 1:

   -2.0000    1.0000
    1.5000   -0.5000

Inverse of matrix 2:

   -4.0000    3.0000
    3.5000   -2.5000

Inverse of matrix 3:

   -6.0000    5.0000
    5.5000   -4.5000