Post by: TrueTears on October 27, 2009, 01:51:25 am
xt1 = 2cos(t)
yt1 = 3sin(t)
the calc manages to sketch a ellipse but it does like 1000000 crazy revolutions and makes it look really "fat and thick"
I have it set in radians mode.
But when it's in degree mode, it sketches a perfectly smooth ellipse but it shouldn't be in degree mode...
Anyone else get this? Or does it sketch a smooth 1 ellipse?
Post by: homghomg1 on October 27, 2009, 01:55:21 am
Post by: TrueTears on October 27, 2009, 01:59:53 am
So I put
(http://img2.imageshack.us/img2/2613/asdfvv.jpg)
Post by: homghomg1 on October 27, 2009, 02:03:20 am
mine is set at pi/24
other than that, i don't know, sorry
Post by: TrueTears on October 27, 2009, 02:05:37 am
hmm then i would say your Tstep is too highohhh it fixed it!! thanks!
mine is set at pi/24
other than that, i don't know, sorry
I set mine to pi/24 as well
so what is "tstep"? How do I know what to set it to for diff graphs?
Post by: Mao on October 27, 2009, 03:11:54 am
E.g drawing a circle, you could evaluate two points according to a set for equations, but that would just be two points, not a circle. You could evaluate 5 points, but that'll be a pentagon. As you take more points, the closer it'll look to a circle.
Much the same thing here, if t_step is large, your graph will be crude. To get a smoother curve, you need to evaluate the function at smaller intervals.
Post by: TrueTears on October 27, 2009, 03:13:47 am
That's the interval at which the calculator evaluates the points.Oh right I see, thanks for that Mao!
E.g drawing a circle, you could evaluate two points according to a set for equations, but that would just be two points, not a circle. You could evaluate 5 points, but that'll be a pentagon. As you take more points, the closer it'll look to a circle.
Much the same thing here, if t_step is large, your graph will be crude. To get a smoother curve, you need to evaluate the function at smaller intervals.
Post by: Hooligan on October 27, 2009, 02:12:29 pm
I just hit F2 6: ZoomStd after putting in the equations. :D Not sure if that's any help now, though. :laugh:
Post by: arthurk on October 27, 2009, 09:15:17 pm
wow i was never taught this. Hows it go?
Post by: Mao on October 28, 2009, 12:30:24 am
Post by: kdgamz on October 28, 2009, 11:03:36 am
In "Mode", in the first option, change from "function" to "parametric"
i did that for my ti 89 and typed in xt1= sin(t), yt1=cos(t)....
but i didnt get a graph???????
wat do i do??/
EDIT: dont worry.........window settings
Post by: arthurk on October 28, 2009, 12:16:07 pm
Post by: TrueTears on October 28, 2009, 03:14:22 pm
Is there anyway to define the domain of the parametric?After each parametric equation type "| t = something "