HP HP-15C User Manual

Section 11: Calculating With Complex Numbers 125
of Complex mode. Instead, you can do either of the following:
 Multiply by -1.
 If you don't want to disturb the rest of the stack, press “ ´
} “ ´ }.
To find the negative of only one part of a complex number in the X-register:
 Press “ to negate the real part only.
 Press ´ } “ ´ } to negate the imaginary
part only, forming the complex conjugate.
Clearing a Complex Number
Inevitably you will need to clear a complex number. You can clear only one
part at a time, but you can then write over both parts (since − and `
disable the stack).
Clearing the Real X-Register. Pressing − (or | `) with the
calculator in Complex mode clears only the number in the real X-register; it
does not clear the number in the imaginary X-register.
Example: Change 6 + 8i to 7 + 8i and subtract it from the previous entry.
(Use ´ } or ´ % to view the imaginary part in X.) Assume a,
b, c and d represent parts of complex numbers.
Re
Im
Re
Im
Re
Im
Re
Im
T
a
b
a
b
a
b
a
b
Z
c
d
c
d
c
d
a
b
Y
6
0
6
0
6
0
c
d
X
6
8
0
8
7
8
-1
-8
Keys:
−
7
- (or other
operation)
Since clearing disables the stack (as explained above), the next number you
enter will replace the cleared value. If you want to replace the real part with
zero, after clearing use v or any other function to terminate digit
entry (otherwise the next number you enter will write over the zero); the
imaginary part will remain unchanged. You can then continue with any
calculator function.

HP HP-15C Specifications

General

Brand	HP
Model	HP-15C
Category	Calculator
Language	English