HP 15c - Manual (Page 166)

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.
P art Imaginary
P art Real
1315 . 0 1691 . 0
0022 . 0 2829 . 0
1017 . 0 0122 . 0
2420 . 0 0254 . 0
}
}
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



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




 
 


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.