
 qr (MATLAB Function Reference) 
  [Q,R] = qr(A) (full and sparse matrices) [Q,R] = qr(A,0) (full and sparse matrices) [Q,R,E] = qr(A) (full matrices) [Q,R,E] = qr(A,0) (full matrices) X = qr(A) (full matrices) R = qr(A) (sparse matrices) [C,R] = qr(A,B) (sparse matrices) R = qr(A,0) (sparse matrices) [C,R] = qr(A,B,0) (sparse matrices) 
  For sparse matrices, the Qless QR factorization allows the solution of sparse least squares problems 
  [Q,R] = qr(A) Q = 0.0776 0.8331 0.5444 0.0605 0.3105 0.4512 0.7709 0.3251 0.5433 0.0694 0.0913 0.8317 0.7762 0.3124 0.3178 0.4461 R = 12.8841 14.5916 16.2992 0 1.0413 2.0826 0 0 0.0000 0 0 0 
 www.cs.berkeley.edu /titan/sww/software/matlab/techdoc/ref/qr.html (376 words) 
