Section 11: Calculating With Complex Numbers 125
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
−
7
-
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.
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