Gaussian Elimination transforms a matrix into an upper triangular form through row operations (row swapping, scaling, and adding multiples of rows). Determinant: After reducing to upper triangular ...
[Fa,Fb,L] = expm_block_tri(A,B,E) computes Fa = e^A, Fb = e^B, and L = D_{exp}(A,B,E), the (1,2) block of exp([A E;O B]), without explicitly computing the exponential of the block triangular matrix, ...