HP 15c - Manual (Page 172)

172 Section 12: Calculating with Matrices
1. Store the elements of A in memory, in the form either of A
P
or of
A
C
.
2. Recall the descriptor of the matrix representing A into the display.
3. If the elements of A were entered in the form A
C
, press ´ p
to transform A
C
into A
P
.
4. Press ´> 2 to transform A
P
into Ã.
5. Press O< to designate the matrix representing A as the
result matrix.
6. Press ∕ to calculate (Ã)
-1
.
7. Redimension A to have half the number of rows as indicated in the
display of its descriptor after the preceding step.
8. Store the elements of B in memory, in the form either of B
P
or
of B
C
.
9. Recall the descriptor of the matrix representing A into the display.
10. Recall the descriptor of the matrix representing B into the display.
11. If the elements of B were entered in the form B
C
, press ´p to
transform B
C
into B
P
.
12. Press ´> 2 to transform B
P
into
13. Designate the result matrix; it must not be the same matrix as either
of the other two.
14. Press *.
15. Press ´> 4 to transpose the result matrix.
16. Press ´> 2.
17. Redimension the result matrix to have half the number of rows as
indicated in the display of its descriptor after the preceding step.
18. Press l< to recall the descriptor of the result matrix.
19. Press ´> 4 to calculate X
P
.
20. If you want the solution in the form X
C
, press |c