HP HP-15C

166 Section 12: Calculating with Matrices
Keystrokes
Display
´ <
B
A
4
4
Designates B as the result
matrix.
∕
b
4
4
Calculates (

)
-1
= (

-1
) and
places the result in matrix B.
´> 3
b
4
2
Transforms (

-1
) into
(

-1
)
P
.
The representation of Z
-1
in partitioned form is contained in matrix B.
PartImaginary
Part Real
1315.01691.0
0022.02829.0
1017.00122.0
2420.00254.0
}
}


















B
Multiplying Complex Matrices
The product of two complex matrices can be calculated by using the fact
that (YX)
P
= 
P
.
To calculate YX, where Y and X are complex matrices:
1.
Store the elements of Y and X in memory, in the form either of
Z
P
or Z
C
.
2.
Recall the descriptor of the matrix representing Y into the
display.
3.
If the elements of Y were entered in the form of Y
C
, press
´p to transform Y
C
into Y
P
.
4.
Press ´> 2 to transform Y
P
into .
5.
Recall the descriptor of the matrix representing X into the
display.
6.
If the elements of X were entered in the form X
C
, press
´p to transform X
C
into X
P
.
7.
Designate the result matrix; it must not be the same matrix as
either of the other two.