HP HP-15C - Page 169

Section 12: Calculating with Matrices 169
4.
Recall the descriptor of the matrix representing A into the display.
5.
If the elements of A were entered in the form of A
C
, press ´
p to transform A
C
into A
P
.
6.
Press ´> 2 to transform A
P
into Ã.
7.
Designate the result matrix; it must not be the same as the matrix
representing A.
8.
Press ÷; this calculates X
P
. The values of these matrix elements
are placed in the result matrix, and the descriptor of the result matrix
is placed in the X-register.
9.
If you want the solution in the form X
C
, press |c.
Note that you don't transform B
P
into 

.
You can derive the complex elements of the solution X by recalling the
elements of X
P
or X
C
and combining them according to the conventions
described earlier.
Example: Engineering student A. C. Dimmer wants to analyze the
electrical circuit shown below. The impedances of the components are
indicated in complex form. Determine the complex representation of the
currents I
1
and I
2
.
This system can be represented by the complex matrix equation





















0
5
30)(200200
20020010
2
I
I
ii
ii
1
or
AX = B.