f08 – Least-squares and Eigenvalue Problems (LAPACK) f08kec 1 Purpose NAG C Library Function Document

nag_dgebrd (f08kec) reduces a real m by n matrix to bidiagonal form. 2 Specification void nag_dgebrd (Nag_OrderType order, Integer m, Integer n, double a[], Integer pda, double d[], double e[], double tauq[], double taup[], NagError *fail) 3 Description nag_dgebrd (f08kec) reduces a real m by n matrix A to bidiagonal form B by an orthogonal transformation: A QBP T, where Q and P T are orthogonal matrices of order m and n respectively. If m n, the reduction is given by