HP 15c User Manual
Page 126
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
Re
Im
Re
Im
Re
Im
Re
Im
T
a
b
a
b
a
b
a
b
a
b
Z
c
d
c
d
c
d
c
d
c
d
Y
e
f
e
f
e
f
e
f
e
f
X
-1
-8
-8
-1
0
-1
5
-1
-1
5
Keys:
}
−
5
}
(continue with
any operation)
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
Re
Im
Re
Im
Re
Im
Re
Im
T
a
b
a
b
c
d
c
d
c
d
Z
c
d
c
d
e
f
e
f
c
d
Y
e
f
e
f
4
5
4
5
e
f
X
-1
5
0
5
4
5
7
0
4
7
Keys:
−
4
v
7
´ V
(continue with
any operation)