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126
Section 11: Calculating With Complex Numbers
Clearing the Imaginary X-Register. To clear the number in the imaginary
X-register, press ´ }, then press −. Press ´ } again to
return the zero, or any new number keyed in, to the imaginary X-register.
Example: Replace -1 -8i by -1 + 5i.
Re
Im
T
a
b
Z
c
d
Y
e
f
X
-1
-8
}
Keys:
Clearing the Real and Imaginary X-Registers. If you want to clear or
replace both the real and imaginary parts of the number in the X-register,
simply press −, which will disable the stack, and enter your new number.
(Enter zeros if you want the X-register to contain zeros.) Alternatively, if
the new number will be purely real (including 0 + 0i), you can quickly clear
or replace the old, complex number by pressing ) followed by zero or
the new, real number.
Example: Replace -1 + 5i with 4 + 7i.
Re
Im
T
a
b
Z
c
d
Y
e
f
X
-1
5
−
Keys:
Re
Im
Re
a
b
c
d
e
f
-8
-1
−
Re
Im
Re
a
b
c
d
e
f
0
5
4 v
Im
Re
a
b
a
c
d
c
e
f
e
0
-1
5
5
Im
Re
c
d
c
e
f
e
4
5
4
4
5
7
7
Im
Re
Im
b
a
d
c
f
e
-1
-1
}
(continue with
any operation)
Im
Re
Im
d
c
d
f
c
d
5
e
0
4
7
´ V
(continue with
any operation)
b
d
f
5
f
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