HP 15c - Manual (Page 161)

Section 12: Calculating with Matrices 161
Instead, calculations with complex matrices are performed by using real
matrices derived from the original complex matrices – in a manner to be
described below – and performing certain transformations in addition to the
regular matrix operations. These transformations are performed by four
calculator functions. This section will describe how to do these calculations.
(There are more examples of calculations with complex matrices in the
HP-15C Advanced Functions Handbook.)
Storing the Elements of a Complex Matrix
Consider an m×n complex matrix Z = X + iY, where X and Y are real
m×n matrices. This matrix can be represented in the calculator as a
2m×n ―partitioned‖ matrix:
P art Imaginary
P art Real
}
}
Y
X






 P
Z
The superscript P signifies that the complex matrix is represented by a
partitioned matrix.
All of the elements of Z
P
are real numbers – those in the upper half
represent the elements of the real part (matrix X), those in the lower half
represent the elements of the imaginary part (matrix Y). The elements of Z
P
are stored in one of the five matrices (A, for example) in the usual manner,
as described earlier in this section.
For example, if Z = X + iY, where
, and
22 21
12 11
22 21
12 11














y y
y y
x x
x x
Y X
then Z can be represented in the calculator by





















 
22 21
12 11
22 21
12 11
y y
y y
x x
x x
P
Y
X
Z A .