HP 15c Scientific manual Entering a Pure Imaginary Number, ´ Continue with any operation

Section 11: Calculating With Complex Numbers 129

Entering a Pure Imaginary Number

There is a shortcut for entering a pure imaginary number into the X-register when you are already in Complex mode: key in the (imaginary) number and press ´ }

Example: Enter 0 + 10i (assuming the last function executed was not − or `.

Keystrokes	Display
10	10	Keys 10 into the displayed
		real X-register and zero into
		the imaginary X-register.
´ }	0.0000	Exchanges numbers in real
		and imaginary X-registers.

Display again shows that the number in the real X- register is zero — as it should be for a pure imaginary number.

The operation of the real and imaginary stacks during this process is illustrated below. (Assume the stack registers contain the numbers resulting from the preceding examples.)

T

Z

Y

X Keys:

Re	Im
e	f
17	144
4	0
4	0

10

Re	Im	Re	Im
e	f	e	f
17	144	17	144
4	0	4	0
10	0	0	10

´} (Continue with any operation.)

Note that pressing ´ } simply exchanges the numbers in the real and imaginary X-registersand not those in the remaining stack registers.