A QR decomposition calculator is an online tool that can be used to find the QR decomposition of a matrix. The QR decomposition is a factorization of a matrix into two matrices, a Q matrix and an R matrix. The Q matrix is a unitary matrix, meaning that its inverse is equal to its transpose. The R matrix is an upper triangular matrix, meaning that all of its elements below the main diagonal are zero.
The QR decomposition is used in a variety of applications, including solving systems of linear equations, finding eigenvalues and eigenvectors, and computing the singular value decomposition. It is also used in image processing, signal processing, and other areas of applied mathematics.