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Mathematics of QR decomposition

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mkhan

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Hi,


When i do QR decomposition in matlab, i can get either two matrices [q,r] or three matrices [q,r,e] where e is a permutation matrix.

My question is when i do both in matlab i get different q and r matrices. i.e. with e and without e, i m getting different q and r matrices, i know e is permutation matix and it translates digonal values into certain order.

Please explain the mathematic behind it? Some mathmatecian, may help me to understand what is going on in QR decompostion.

Thanks in advance,

Arif Khan
 

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