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   Home :: Community :: Surveys :: Can you reproduce the 3D graph in the ticalc.org logo?
Results
Choice Votes   Percent
Yes 62 34.1%   
No 120 65.9%   

Survey posted 2003-06-06 23:32 by Henrik.

Contribute ideas to surveys by sending a mail to survey@ticalc.org.

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Comment Counter
Michael O'Brien  Account Info
(Web Page)

this is OT but I think it could help the gerneral user somewhat. I think it is safe to asy that someone checks the news items and the replies to them based on whether or not they have read the news yet and if there are any new posts. Well, it would be beneficial if the same "comment counter" could be added to the bottom of the survey under the "Results" and "Vote" buttons.

Reply to this comment    9 June 2003, 22:26 GMT

Re: Comment Counter
no_one_2000_  Account Info
(Web Page)

I feel the same way, could this be done? That would be great... I do the exact same thing.

Reply to this comment    9 June 2003, 22:51 GMT


Re: Comment Counter
RCTParRoThEaD_ Account Info
(Web Page)

I was gonna mention this, but i've been too lazy.

Reply to this comment    10 June 2003, 01:29 GMT


Re: Re: Comment Counter
no_one_2000_  Account Info
(Web Page)

I think that someone (maybe it was Michael O'Brien again, or it might have been you) mentioned it a few months ago. They should have that right beside the contributor of the survey! ;-)

Reply to this comment    10 June 2003, 02:07 GMT


Re: Re: Re: Comment Counter
Michael O'Brien  Account Info
(Web Page)

I think it was RCT because I can't remember doing that. But If someone did say anything about it I'm pretty sure I would have endorsed it.

Reply to this comment    10 June 2003, 16:23 GMT


I love boobies.
RCTParRoThEaD_ Account Info
(Web Page)

yes, since i have all the good ideas around here. :-p

Reply to this comment    12 June 2003, 04:36 GMT


Re: I love boobies.
no_one_2000_  Account Info
(Web Page)

Uh, like your subject?

LOL

Reply to this comment    14 June 2003, 18:41 GMT


Re: Re: I love boobies.
Soth  Account Info
(Web Page)

Yeh, they are lovely birds are't they, such beautiful colours on their feathers.

Reply to this comment    15 June 2003, 13:14 GMT


Re: Re: Re: I love boobies.
no_one_2000_  Account Info
(Web Page)

LOL ;-)

Reply to this comment    15 June 2003, 17:53 GMT

Just Wondering...
RCTParRoThEaD_ Account Info
(Web Page)

Does anybody think it could be possible that it was drawn in by hand using the pen?

Reply to this comment    9 June 2003, 22:39 GMT

Re: Just Wondering...
no_one_2000_  Account Info
(Web Page)

I guess, but if they did, then they had more time on their hands than I do, which isn't possible. ;-)

It looks like a 3D graph, anyway. If someone could just do that with pen, then I would have to go hunt them down.

Reply to this comment    9 June 2003, 22:53 GMT


Re: Re: Just Wondering...
slimey_limey  Account Info
(Web Page)

It's the same image that TI has of the 89 on their site.

Reply to this comment    10 June 2003, 02:19 GMT


Re: Re: Re: Just Wondering...
no_one_2000_  Account Info
(Web Page)

Maybe ticalc stole it from THEM! LOL... Mulanda made it with pen :)

Reply to this comment    14 June 2003, 18:42 GMT


Re: Just Wondering...
Soth  Account Info
(Web Page)

No. It would be much quicker and easier to do by machine. It should be a relatively simple graph - you just need to know what it is.

Reply to this comment    10 June 2003, 03:05 GMT

This just in from TI
JcN  Account Info

I e-mailed TI for the equation, and this is how they replied:

Jude,

Thank you for contacting Texas Instruments, an educational technology
company.

The equation for the 3D graph found on the TI-89 is:

20*cos((x^2 +y^2)/4)
z(x,y) = -------------------------------
(x^2 +y^2 + pi)

WINDOW:
eyetheta = 20
eyephi = 70
xmin = -5
xmax = 5
xgrid = 20
ymin = -5
ymax = 5
ygrid = 20
zmin = -1.2953 (approx)
zmax = 6.3662 (approx)
zscl = 1

Hint: The calculator has to be in Radian mode.

Regards,

Yowanda Brooks


Hope this helps :)

Reply to this comment    10 June 2003, 06:59 GMT

Re: This just in from TI
paj12  Account Info

Boy, that's a mouthful. I can't tell cause of the font, but I'm assuming that's a fraction with the top part being a numerator and the bottom part being the denominator. Also, I know absolutely zilch about 3D graphing. What is eyetheta and eyephi?

Reply to this comment    10 June 2003, 07:46 GMT

Re: Re: This just in from TI
Michael O'Brien  Account Info
(Web Page)

eyetheta and eyephi are two variables, if you want to calll them that, that are used to view the graph at different angles relative to a separate axis.

Reply to this comment    10 June 2003, 16:25 GMT


Re: Re: This just in from TI
techfury  Account Info

Really beats me on what eyephi is supposed to look like, but I asked TI before this poll, and i got the EXACT same email you did JcN!

Reply to this comment    10 June 2003, 16:28 GMT


Re: Re: Re: This just in from TI
JcN  Account Info

It's probably an auto-response e-mail.

Reply to this comment    10 June 2003, 19:37 GMT


Re: Re: Re: Re: This just in from TI
RCTParRoThEaD_ Account Info
(Web Page)

or they copy and paste that stuff.

Reply to this comment    12 June 2003, 06:51 GMT


Re: Re: Re: Re: Re: This just in from TI
no_one_2000_  Account Info
(Web Page)

A lot of people probably e-mailed them after seeing this poll... LOL

Reply to this comment    14 June 2003, 18:43 GMT


Re: This just in from TI
JcN  Account Info

Okay, I know the equation looks a bit odd in this text (because of the font differences), so here it is:

z1(x,y) = (20*cos((x^2+y^2)/4)/(x^2+y^2+pi)

You actually need to tinker with the zmin and zmax variables to make the "hump" in the center look taller. Apparently, that is the equation used, even though it (at first) doesn't look like the logo when graphed.

Reply to this comment    10 June 2003, 19:37 GMT


Re: Re: This just in from TI
Jesse Palmer  Account Info
(Web Page)

any ideas on how to graph this with Graph³ for TI-83 Plus? I just get a hill with no "waves" :(

Reply to this comment    13 June 2003, 20:33 GMT

Re: Re: Re: This just in from TI
JcN  Account Info

Use the equation mentioned above, but make sure that your calc is in radians. Set the window factors like this:

xmin = -6
xmax = 6
ymin = -6
ymax = 6
zmin = -1.2953
zmax = 6.3662

That should produce a graph similar to the logo, but because of the limitations of the TI-83+ pixel density, the graph will look more vague and "choppy".

Reply to this comment    14 June 2003, 17:22 GMT


Re: Re: Re: This just in from TI
Nick_S  Account Info

you do get the "waves" but the 83+ chops it off right as the "waves" start.
Try viewing it at different angles-You'll see what I mean

Nick_S

"Now where's my beans?!",0

Reply to this comment    1 September 2003, 05:46 GMT

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