HP 15c Scientific Entering a Pure Imaginary Number

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.)

	Re	Im		Re	Im	Re	Im
T	e	f		e	f	e	f
Z	17	144		17	144	17	144
Y	4	0		4	0	4	0
X	4	0		10	0	0	10
Keys:
			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.