Realwhz

QR decomposition

Hello. I'm afraid I was a bit too fast in reverting your edits to QR decomposition, about which factor is rectangular. I went through some books and there does not seem to be a standard, so I reinstated your edits. Sorry about this. Cheers, Jitse Niesen (talk) 12:39, 7 April 2008 (UTC)

From: realwhz

Hi. As far as I know, both of these two definitions exist. The first one (Q is mxm, and R is mxn) is used in many text books and also many numerical applications, such as LAPACK and Matlab. But the second one does exist too. Since I think the first one may be used more frequently (partly due to the popularity of Matlab etc), I select it as the first candidate and the original one as an alternative one. It is just my personal opinion. Please correct me if necessary.

It's fair enough. I do think the extra information in the Q factor is weird, but I'm nothing against Golub & Van Loan and Matlab, So let's keep Q is square as the primary definition. By the way, a long overdue welcome at Wikipedia, and I hope to see more of your contributions. -- Jitse Niesen (talk) 21:53, 7 April 2008 (UTC)

By the way, if you ever need help, just email me (do a web search for "Jitse Niesen" to find my email address). Wikipedia is getting more and more hostile against new editors, even those like you that clearly know about their stuff. -- Jitse Niesen (talk) 21:56, 7 April 2008 (UTC)

Thank you for your suggestions and encouragement :-) --Realwhz (talk) 06:42, 8 April 2008 (UTC)

Your recent edits

Hi there. In case you didn't know, when you add content to talk pages and Wikipedia pages that have open discussion, you should sign your posts by typing four tildes ( ~~~~ ) at the end of your comment. If you can't type the tilde character, you should click on the signature button located above the edit window. This will automatically insert a signature with your name and the time you posted the comment. This information is useful because other editors will be able to tell who said what, and when. Thank you! --SineBot (talk) 18:06, 7 April 2008 (UTC)

Thank you :-) And, just have a try --Realwhz (talk) 06:30, 8 April 2008 (UTC)