LOGIN  .  SIGNUP   .  SUPPORT 
HOME / MESSAGE BOARDS / GENERAL DISCUSSIONS

General Discussions

Signup   Message Boards Home   Newest Posts   My Favorite Boards   My Threads
Page 1 of 1
Signup or Login to Post
Math
 
skittles234  posted on Oct 07, 2010 7:29:42 PM - Report post

Current rank: 1.5 Stars. Next Rank at 500 Posts.
Send a message to skittles234
ELITE
So I was bored one day in math class (Calc ab) and as many people do I pulled out my trusted TI-83 and was graphing random things. And I came across an enigma.

I graphed "log(X)/sin(x^cos(X))" (in radians) with the window set to
"Xmin=0
Xmax=10"

I then set the window to normal (Xmin=-10) and I got an error. And I thought why? Because the log of a negative doesn't exist, so I graphed "log(abs(X))/sin(X^cos(X))" with the window set to normal. It gave me the same error

So after a little bit of work, I discover that when X=-1 (for example) sin(-1^cos(-1)) = -.115+.904i so that made sense. But shouldn't the same thing happen after X=2pi?

Any explanation would help greatly.

 
DABhand  posted on Oct 08, 2010 6:14:55 PM - Report post

Current rank: 3.5 Stars. Next Rank at 8000 Posts.
Send a message to DABhand
AUTHOR
Maybe it was because you can actually divide by 0 with that equation, and we all know it means the end of the universe if you try.
 
Neo7  posted on Oct 13, 2010 7:18:10 AM - Report post

Moderator
Send a message to Neo7
MODERATOR
Set the domain for 0 >= x >= 2*pi

Division by zero shouldn't matter when graphing an equation as the calculator will either insert a hole or an asymptote where the equation would be undefined. It doesn't know now to deal with non-real values though.

[Edited by Neo7, 10/13/2010 7:19:56 AM]

 
TalonKarde  posted on Oct 13, 2010 7:58:58 AM - Report post

Current rank: 2 Stars. Next Rank at 1000 Posts.
Send a message to TalonKarde
ELITE
jimmy buffet said it best in the song of the same name "Math Sucks."
 
skittles234  posted on Oct 13, 2010 1:56:57 PM - Report post

Current rank: 1.5 Stars. Next Rank at 500 Posts.
Send a message to skittles234
ELITE
quote:
originally posted by Neo7

Set the domain for 0 >= x >= 2*pi

Division by zero shouldn't matter when graphing an equation as the calculator will either insert a hole or an asymptote where the equation would be undefined. It doesn't know now to deal with non-real values though.

[Edited by Neo7, 10/13/2010 7:19:56 AM]

But that's the thing, it lets you graph the equation even when the domain is set to 0>=x>=10, rather than 0>=x>=2*pi. The only time it doesn't let you is when the domain is -10>=x>=10.

 
Toastman  posted on Oct 14, 2010 8:48:35 AM - Report post

Current rank: 2.5 Stars. Next Rank at 2000 Posts.
Send a message to Toastman
ELITE
quote:
originally posted by skittles234

quote:
originally posted by Neo7

Set the domain for 0 >= x >= 2*pi

Division by zero shouldn't matter when graphing an equation as the calculator will either insert a hole or an asymptote where the equation would be undefined. It doesn't know now to deal with non-real values though.

[Edited by Neo7, 10/13/2010 7:19:56 AM]

But that's the thing, it lets you graph the equation even when the domain is set to 0>=x>=10, rather than 0>=x>=2*pi. The only time it doesn't let you is when the domain is -10>=x>=10.

Ugh. I understand what you're talking about. This isn't good. College is learning me things.

Page 1 of 1
  Post Reply
 
All times are (GMT -06:00) Central Time (US & Canada). Current time is 9:30:06 PM
CoSMOS Gamehacking Tool
  
Introducing Cheat Happens CoSMOS, a brand new self-service gamehacking tool designed for absolute beginners and advanced users alike. CoSMOS makes it easy and fun to hack your own PC games while waiting for our programming team to release new and updated trainers.

Featuring in-app tutorials, plenty of video demos, download CoSMOS today and start enhancing your favorite games in minutes.

Message Board Moderators
Neo7
Neo7
Latiosmaster47Latiosm.
forty-twoforty-two
HonestGamerHonestG.
dstatesdstates
Important Board Topics
Trending Topics