HP HP-15C - The Result Matrix

146 Section 4: Using Matrix Operations
Keystrokes
B
1
Display
093- 30
094- 1
095-42,23,13
096- 45 11
097-42,16, 1
098- 43 32
Dimensions matrix C as
pXl.
Recalls q.
Sets k = I = 1.
Labels used: A, B, C, and 1 through 5.
Registers used: R0, RI, and R2 (p + 2 and w).
Matrices used: A (working matrix) and C (parameter estimates).
Flags used: 0 and 8.
With this program stored, the HP-15C has enough memory to work
with up to p = 4 parameters. If programs "A" and "C" are deleted,
you can work withp = 5 parameters. In either case, there is no limit
to the number of rows that you can enter.
To use this program:
1. Press 2 OQ| DIM |[oFI to reserve registers R0 through R2.
2. Press |7)|USER| to activate User mode.
3. Enter (p + 2) and (p + 1) into the stack, then press |T1|DIM|[Al
to dimension matrix A. The dimensions depend on the
number of parameters that you use, denoted by p.
4. Press 0 [STOll MATRIX |[Alto initialize matrix A.
5. Enter the weight w^ of the current row, then press [A]. The
display should show 1.0000 to indicate that the program is
ready for the first row element. (For ordinary least-squares
problems, use w/{ = 1 for each row.)
6. Enter the elements of the row m of matrix A by pressing xm x
| R/S| xm2 | R/S| ... xmp |R/S| ym [R/s]. After each element is
entered, the display should show the number of the next
element to be entered. (If you make a mistake while entering
the elements, go back and repeat steps 5 and 6 for that row.
7. Press |"B"| to update the factorization to include the row
entered in the previous two steps.