Dear J Forum: I've been experimenting with 128!:0 (QR matrix decomposition) as follows: B =. |: A =. ? 4 7 $10 $ each B;A ----T---┐ │7 4│4 7│ L---+---- $ each 128!:0 A |length error | $each 128!:0 A $ each 128!:0 B ----T---┐ │7 4│4 4│ L---+---- This suggests that the row dimension of the argument must be greater than or equal to the column dimension, and hence that T(Q) mmult Q is the identity matrix (orthogonal/Hermetian). If so, then noting this in the Vocabulary would be helpful. Sincerely,
Leigh Leigh Joseph Halliwell, FCAS, MAAA Chief Manager L. J. Halliwell, LLC P. O. Box 21385 Chattanooga, TN 37424 423-296-2739 423-605-5789 cell 423-954-2772 fax <BLOCKED::mailto:[email protected]> [email protected] <blocked::http://www.lhalliwell.com> www.lhalliwell.com This communication is intended solely for the use of the individual to whom or the entity to which it is addressed. It may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If you are neither the intended recipient, nor the employee, nor the agent responsible for delivering the communication to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by telephone or email, delete the communication from any computer or other electronic storage media, and destroy all other copies in your possession. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
