Cuvee RPN-67 & Complex mode

[Matt Agajanian]

Thank for the explanation. I do understand how to use h CPLX. Yes, that’s pretty straightforward.

But, to me it doesn’t make sense that once you’re in complex mode, shouldn’t that mean 3+4i x 9+5i is entered as.

3 ENTER
4 ENTER
9 ENTER
5 ENTER X

since complex mode is active?

But, I'm still puzzled about the 1 g OP CPLX MODE function.

I could see the checking mode operation as
(n<> 0 and n<>1) g OP CPX MODE.

But, why wouldn’t activating Complex Mode first with 1 g OP CPX MODE and then to evaluate 3+4i x 9+8i entering 3 ENTER 4 ENTER 9 ENTER 8 X would reveal the real component in X and imaginary component would be in Y.

In other words, shouldn’t 1 g OP CPX MODE already be sufficient to set up complex mode?

(10-14-2022 02:45 PM)Nigel (UK) Wrote:  A brief explanation can be found here (search for CPLX on that page). In short, you can't enter complex numbers onto the stack while you are in complex mode! You have to leave complex mode first, enter the numbers, and then go into complex mode and press whatever buttons you like.

So to multiply (1+2i) by (3+4i) you would:

• Make sure you're not in CPLX mode. If you are, press h CPLX (top left key) to leave it.
• Press 2 ENTER 1 ENTER 4 ENTER 3 (don't press ENTER here)
• Press h CPLX to turn on complex mode (don't use g OP 1), and then press \(\times\).
• The display now shows the real part of the result (-5 in this case); press x<>y to see the imaginary part.
  

If you now want to enter another complex number you have to leave complex mode. At least, I can't see how to enter complex numbers while in complex mode! (I tried using x<>y to separate real and imaginary parts, but it doesn't work: when the imaginary part of the new complex number is entered, the T register changes.)

Note that using g OP 1 to enter and leave complex mode isn't the way to go, as this consumes the contents of the x-register.

Well, you wouldn't want it to be easy and/or intuitive, would you? If it were, anyone could use it!

(Apologies if I'm overlooking something simple here.)

Nigel (UK)