HP 15c Scientific manual Entering Complex Numbers with −. The clearing functions, ´ %hold release

Section 11: Calculating With Complex Numbers 127

Entering Complex Numbers with −. The clearing functions − and

`can also be used with } as an alternative method of entering (and clearing) complex numbers. Using this method, you can enter a complex number using only the X-register, without affecting the rest of the stack. (This is possible because − and ` disable stack lift.) Executing } will also create an imaginary stack if one is not already present.

Example: Enter 9 + 8i without moving the stack and then find its square.

Keystrokes

(−)

8

´ }

−

9

x

´%(hold) (release)

	Re	Im
T	a	b
Z	c	d
Y	e	f
X	4	7

Keys:

Display

(0.0000)

8

7.0000

0.0000

9

17.0000

144.0000

17.0000

Re	Im
a	b
c	d

ef

0 7

−

Prevents stack lift when the next digit (8) is keyed in. Omit this step if you'd rather save what's in X and lose what's in T.

Enter imaginary part first.

Displays real part; Complex mode activated.

Disables stack. (Otherwise, it would lift following }.)

Enters real part (digit entry not terminated).

Real part. Imaginary part.

Re	Im	Re	Im
a	b	a	b
c	d	c	d
e	f	e	f
8	7	7	8

8´ }