MATLAB: Access Diagonal Matrix Element

diagonalmatrix manipulation

Hello,

I have matrix 15×60 dimension. How can I generate diagonal data?

If I use "diag" function, I only got matrix 15×1.

Thank you,

Ana

Best Answer

As it is a rectangular matrix you will get 15 diagonal(i=j) elements. If you have a square matrix of size nxn, you will get n diagonal elements.

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MATLAB: Change diagonal place

a= magic(3)
a =
       8     1     6
       3     5     7
       4     9     2
>> b=a;
>>  for i =2:size(a,1)
b(i,1:i)= fliplr(a(i,1:i));
end
b
b =
       8     1     6
       5     3     7
       2     9     4

MATLAB: What is the inversion method used in (inv) function in MATLAB

read the documentation:

"inv performs an LU decomposition of the input matrix (or an LDL decomposition if the input matrix is Hermitian). It then uses the results to form a linear system whose solution is the matrix inverse inv(X). For sparse inputs, inv(X) creates a sparse identity matrix and uses backslash, X\speye(size(X))."

Best Answer

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MATLAB: Change diagonal place

MATLAB: What is the inversion method used in (inv) function in MATLAB

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