LU Decomposition Calculator
Enter your matrix in the blue screen.
If there is any ? symbols, A has more than one LU factorizations.
Enter any real number in the ? cell on the yellow matrix to get a solution.
If there are more than one ? on the yellow matrix,
Enter any real number in the ? cells, starting from the top left to the bottom right on the yellow matrix.
If there is still some cells with ? on the green matrix, then enter any real number in the ? cell, starting from the top left to the bottom right to get a solution.
If there is any ∞ symbols, then A has no LU factorization.
To get the LU for a "nearby" matrix, read the instruction in the paper here.
Click the link below for an nxn matrix calculator
https://sites.google.com/site/phanyamada/Home/students-work-with-geogebra