Why does it do it faster? i never even heard of the imaginary i being used this way before.

It's faster because instead of having to calculate each pixel location on the circle, the calculator only calculates an eighth of it and uses circle symmetry (read: negation) to copy that slice to all the other parts. I've always wondered why it isn't default on the TI-83 Plus series and needs at least two more bytes

EDIT: Three more.

other things are Line(X1,Y1,X2,Y2,[0]) will make the line be a black or white line, and Text([-1],X,Y makes small or large text.

I think TI actually does document that. It's in the user's manual.

Quote from: nemo on September 03, 2010, 08:45:33 pm

other things are Line(X1,Y1,X2,Y2,[0]) will make the line be a black or white line, and Text([-1],X,Y makes small or large text.

I think TI actually does document that. It's in the user's manual.

They documented the Line() 5th argument, but neither the Text(-1 and Circle imaginary i arguments. I checked in the huge TI-83+ manual I got that came with my calc 9 years ago and it got nothing about it.

Quote from: meishe91 on September 07, 2010, 08:09:27 pm

OH YA! I remember seeing something like that a long time ago. Completely forgot. I actually emailed TI-Cares to see if I can get an answer to why this is undocumented and such

Did you get an actual answer?

Sort of actually. I mean it still seemed generic but it was actually somewhat specified. They haven't given me an answer to question yet but they are apparently passing it off to the Technical Escalation Team, what ever that is.

This is what I got back so far:

Josh,

Thank you for contacting Texas Instruments!

Upon investigating and trying the problem that you have provided me, I have not been able to provide a solution or concrete answer as to why {i} is essentially causing your circle to graph faster. So what I will do is escalate your case on to Technical Escalations, and my Escalations Team will take it from there. So that the Escalation Team will have a good contact point, I would like for you to please supply me with the following information:

-Your last name
-A good phone number to contact you back with if need be
-The operating system you are using on your TI-84 Plus Unit

Another resource you can use to find answers to your questions, example calculations and other information is our Knowledge Base. The Knowledge Base is accessible to you 24 hours a day, 7 days a week.

http://support.education.ti.com

I hope that you find this information helpful. If you have further questions or comments, please feel free to send me an email.

Warmest Regards,

Keith Sargent

Well I feel like since it's an extra argument that was added it was intentional put there. In the reply I also stated that this was not a problem and that it is actually very useful and fast.

On topic though:
Nemo, did you ever get a chance to show your teacher?

i was going to show her, but didn't after she took a student's calculator away when the student made a program to do sigma notation (i lol'd, thinking of the sum(seq([EXP],[Var],[start],[end])) trick.

i was going to show her, but didn't after she took a student's calculator away when the student made a program to do sigma notation (i lol'd, thinking of the sum(seq([EXP],[Var],[start],[end])) trick.

Wow...
That's saddening.