# Thread: New guy in town.

1. ## New guy in town.

Hi, I'm new to the forum. I'm an electrical engineer and was drawn to this forum as a site to help me answer a question about my new HP 35s calculator:

How do I enter Euler's equation using the 35s?

Euler's equation is e exp(i*pi) + 1 = 0

I can't get the calculator to put the complex pi in the exponent. I can do this with my HP 42s but the 35s keeps converting it to a real number. Any suggestions?

Thanks,
Ike

2. Originally Posted by ike
Hi, I'm new to the forum. I'm an electrical engineer and was drawn to this forum as a site to help me answer a question about my new HP 35s calculator:

How do I enter Euler's equation using the 35s?

Euler's equation is e exp(i*pi) + 1 = 0

I can't get the calculator to put the complex pi in the exponent. I can do this with my HP 42s but the 35s keeps converting it to a real number. Any suggestions?

Thanks,
Ike
I do not have any cool calculators but I remember when I use my friends one a few years ago it had 2 features. One is to accept complex numbers. The other to accept radian/degree mode. So change it to complex number mode and then to radian mode. And try using it. I might be wrong but that is how I remember it.

3. Originally Posted by ThePerfectHacker
I do not have any cool calculators but I remember when I use my friends one a few years ago it had 2 features. One is to accept complex numbers. The other to accept radian/degree mode. So change it to complex number mode and then to radian mode. And try using it. I might be wrong but that is how I remember it.
There is no complex mode, but there is a radian mode. I did try radian mode but still no good. After talking with HP technical support for a while I am convinced that the calculator has an engineering design flaw.

When entering the imaginary part of a complex number from a stored variable or constant weird things happen. It just isn't acceptable so the calculator goes back - too bad, otherwise it was a nice calculator. I'll just stay with my HP 42s - it's a real work horse.

Cheers,
Ike

4. Originally Posted by ike
There is no complex mode, but there is a radian mode. I did try radian mode but still no good. After talking with HP technical support for a while I am convinced that the calculator has an engineering design flaw.

When entering the imaginary part of a complex number from a stored variable or constant weird things happen. It just isn't acceptable so the calculator goes back - too bad, otherwise it was a nice calculator. I'll just stay with my HP 42s - it's a real work horse.

Cheers,
Ike
Bah! Get a TI-Voyager, if you can afford one. I've got the TI-92 (its predecessor) when it first came out (years ago) and it still works like a charm and can do practically anything you might want.

-Dan