QR, Aztec, Cyber, and Data Matrix are types of what?
QR code QR code QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached. A QR code uses four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to store data efficiently; extensions may also be used. The Quick Response (QR code) system became popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes. Applications include product
QR decomposition QR decomposition In linear algebra, a QR decomposition (also called a QR factorization) of a matrix is a decomposition of a matrix "A" into a product "A" = "QR" of an orthogonal matrix "Q" and an upper triangular matrix "R". QR decomposition is often used to solve the linear least squares problem and is the basis for a particular eigenvalue algorithm, the QR algorithm. Any real square matrix "A" may be decomposed as where "Q" is an orthogonal matrix (its columns are orthogonal unit vectors meaning formula_2) and "R" is an upper triangular matrix (also called right triangular matrix). If