## Iannix & Equations

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This topic contains 5 replies, has 2 voices, and was last updated by  _203 2 years, 5 months ago.

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• #3833 Reply

_203

Hi,

I’m totally unfamiliar with Trig in general, but I’d like to use this curve equation — (cos(t)+cos(29t)/2+sin(61t)/3, sin(t)+sin(29t)/2+cos(61t)/3) — in Iannix (and equations like it). It doesn’t work when entered into the curve equation window, can someone give me a brief explanation? How would I write it so Iannix understands it?

Many thanks.

#3834 Reply

IanniX
Keymaster

Yep, you need 3 equations : how ‘x’ depends on ‘t’, ‘y’ depends on ‘t’ and z depends on ‘z’ (or in a polar way, how radius, angles depends on ‘t’).
So you need 3 equations, not only one. Or you need to put constant values in other equations. You need something like that

``````cos(t)+cos(29*t)/2+sin(61*t)/3
,
sin(t)+sin(29*t)/2+cos(61*t)/3
,
0``````
#3838 Reply

_203

Fantastic! Thank you. I definitely have more studying to do.

#3839 Reply

_203

Another q – is there a way to define a range of t? Like: -10 ≤ t ≤ 10? For example, if I head to http://graphsketch.com/parametric.php and plot cos(100t) on x(t), and sin(100t) on y(t) w/ the previously expressed range, I get what looks like a gear.

Am I looking at this in an off way? Could you point me somewhere that can explain the basics of what I’m looking to do? Thanks again, appreciate you bearing w/ me & my lack of knowledge.

#3840 Reply

IanniX
Keymaster

In IanniX, `t` goes from 0 to 1. So instead of drawing `f(t)` with `t` going from -10 to 10, draw `f((t+10)/(10--10))` = `f((t+10)/20)` = replace all the `t` by `(t+10)/20`

#3842 Reply

_203

Very good, thanks for your quick response Iannix.

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