# How do you find Lu in Matlab?

## How do you find Lu in Matlab?

[ L , U ] = lu( A ) factorizes the full or sparse matrix A into an upper triangular matrix U and a permuted lower triangular matrix L such that A = L*U . [ L , U , P ] = lu( A ) also returns a permutation matrix P such that A = P’*L*U . With this syntax, L is unit lower triangular and U is upper triangular.

## How do you use LU command in Matlab?

[L,U,p,q,R] = lu( A , ‘vector’ ) returns the permutation information in two row vectors p and q , such that R(:,p)\A(:,q) = L*U . lu( A ) returns the matrix that contains the strictly lower triangular matrix L (the matrix without its unit diagonal) and the upper triangular matrix U as submatrices.

How do you find the eigenvalues of a matrix in Matlab?

e = eig( A ) returns a column vector containing the eigenvalues of square matrix A . [ V , D ] = eig( A ) returns diagonal matrix D of eigenvalues and matrix V whose columns are the corresponding right eigenvectors, so that A*V = V*D .

What is permutation matrix in LU decomposition?

It is also referred to as the LU factorization with Partial Pivoting (LUP) with row permutations only. An LU factorization with full pivoting involves both row and column permutations, PAQ=LU, P A Q = L U , where L and U, and P are defined as before, and Q is a permutation matrix that reorders the columns of A.

### How do you find the eigenvalues of a matrix?

In order to find eigenvalues of a matrix, following steps are to followed:

1. Step 1: Make sure the given matrix A is a square matrix.
2. Step 2: Estimate the matrix.
3. Step 3: Find the determinant of matrix.
4. Step 4: From the equation thus obtained, calculate all the possible values of.
5. Example 2: Find the eigenvalues of.

### How do you prove that Lu is unique?

Theorem: If an upper triangular matrix U can be produced by Gauss elimination from a matrix A (i.e., no 0 diagonal elements are encountered) in the process, then A has a unique factorization in the form A = LU, where L is a low triangular matrix with all 1’s in the diagonal.

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