Analyse graph on parametrics

[Scott Marley]

Hi all,

Is there any way to get the TI-nspire cx to perform any of the 'analyse graph' functions on parametric equations? Specifically I'm looking for intersection with the x-axis and min/max points. It looks like this isn't possible, but was wondering if anyone knew any workarounds?

Thanks for any light you can throw on the situation.

[John Hanna]

No, Analyze does not apply to parametrics because the x- and y expressions are independent of one another. Consider x(t)= sin(t) and y(t)=t^2. Analyze that!

 

Regards

     John Hanna

     jeh...@optonline.net

     www.johnhanna.us

     T³ - Teachers Teaching with Technology

     "the future isn't what it used to be."

 

---

--
--
To post to this group, send email to tins...@googlegroups.com
To unsubscribe send email to tinspire+u...@googlegroups.com
For more options, visit this group at
http://groups.google.com.au/group/tinspire?hl=en-GB?hl=en-GB
The tns documents shared by group members are archived at
https://sites.google.com/site/tinspiregroup/classroom-news/welcome-abouttime

---
You received this message because you are subscribed to the Google Groups "tinspire" group.
To unsubscribe from this group and stop receiving emails from it, send an email to tinspire+u...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[John Losse]

Scott,

Not sure how much “working around” you are willing to do, but here is an idea.

Enter your parametric as usual (x1(t), y1(t))

Next enter f1(x)=x1(x)   and f2(x)=y1(x)

You are then free to use “analyze” on the f’s.

For example, the image shows a Lissajous figure.  To find where the rightmost point is, you are looking for where dx1/dt =0, giving a vertical tangent.

Define f3=d(f1)/dx and use “analyze” to find that its zero is at x=0.524…

Trace the Lissajous to the point where t=.524…. and you have it.