Solution 11719: Calculating the QR Factorization of a Matrix on the TI-89 Family, TI-92 Plus, or Voyage™ 200 Graphing Calculators.
How do I calculate the QR factorization of a matrix on the TI-89 family, TI-92 Plus, or Voyage 200 graphing calculator?
The instructions below demonstrate how to compute the QR factorization of a matrix on the TI-89, TI-92 Plus and Voyage 200.
Matrix for this example is below:
To enter the matrix A into the data matrix editor:
1) Press [APPS], select the Data/Matrix icon, and press  for New. (If desktop icons are not used, press [APPS]  )
2) The type will be Matrix, the name is A and the dimensions are both 3.
3) Press [ENTER] twice.
4) Input the values above in the data matrix editor, 6 [ENTER] 12 [ENTER] etc.
5) After entering all the values, exit the matrix editor and go the Home screen.
To Calculate the QR factorization of the matrix enter the following:
QR A, qm, rm [ENTER]. The display will show "Done".
To display the Q matrix, press qm [ENTER].
To display the R matrix, press rm [ENTER].
Please see the TI-89 family, TI-92 family, and Voyage 200 guidebooks for additional information.