1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Graphing calculator help

  1. Sep 23, 2009 #1
    I am trying to graph: r²= sinθ in Polar mode.
     
  2. jcsd
  3. Sep 23, 2009 #2
    Did you change your calculator to use Polar GC and not Rect GC (assuming you're using a TI-83 or 84).
     
  4. Sep 23, 2009 #3
    Yes, I did. I know how to graph polar curves, but the issue I am having is with r square.
    The calculator can only graph r !!!
     
  5. Sep 23, 2009 #4

    Office_Shredder

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Graph

    [tex]r= \sqrt{sin \theta }}[/tex]

    instead. r is always positive anyway so you shouldn't miss anything
     
  6. Sep 23, 2009 #5
    it only graphs half the lemniscate on 0, 2pi

    the only way I could find to draw it is using r= square root theta and - square root theta simultaneousely.
     
  7. Sep 23, 2009 #6

    Office_Shredder

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It should only graph half. If theta is between pi and 2pi, sin(theta) is negative and no value of r will square to a negative number.

    EDIT: Unless you allow negative r for a value of theta between pi and 2pi. In which case there's probably no way to graph this on your graphing calculator with a single equation
     
  8. Sep 24, 2009 #7
    yeah, I missed that.

    But how can we draw a lemniscate then?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Graphing calculator help
  1. Help with graphing (Replies: 4)

Loading...