ecrire un script qui produit la décomposition lu in matlab

To perform LU decomposition in MATLAB, you can use the lu function.

Here's a sample code that shows how to perform LU decomposition of a matrix A in MATLAB:

main.m
% Define matrix A
A = [3 1 2;
     6 3 4;
     3 1 5];

% Perform LU decomposition of matrix A
[L,U,P] = lu(A);

% Display the results
disp('Matrix A:')
disp(A)
disp('L matrix:')
disp(L)
disp('U matrix:')
disp(U)
disp('P matrix:')
disp(P)
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In the code above, lu(A) returns the lower triangular matrix L, the upper triangular matrix U, and the permutation matrix P. The permutation matrix P is used to reorder the rows of A during the decomposition.

You can learn more about the lu function and other matrix decomposition functions in MATLAB's documentation.