| QR algorithmA QR algorithm is a procedure to calculate the eigenvalues of a matrix. The basic idea is to iterate alternate steps of taking the QR decomposition of a matrix, and writing the factors in the other order as RQ''. For reasons of computational complexity, t | QR CodeA QR Code is a matrix code (or two dimensional bar code) created by Denso in 1994. The "QR" is derived from "Quick Response", as the creator intended the code to allow its contents to be decoded at high speed. QR Codes are most common in Japan, and are cu | |