Education Technology

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 [3] for New. (If desktop icons are not used, press [APPS] [6] [3])
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.