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Need help reading 3-D

  1. Feb 11, 2012 #1
    Ok, so I am having help knowing when x,y,z are positive or negative. My graph looks something similar to this..





    I am really confused as to when a location in all 3 axes is negative or positive in all x,y,z.
  2. jcsd
  3. Feb 12, 2012 #2
    Your diagram doesn't really explain what you are getting at. You might want to elaborate?
  4. Feb 12, 2012 #3

    jim hardy

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    Science Advisor
    Gold Member

    Well, i may not understand the question either.
    See if this is on track -

    it's the duty of the guy who's writing the book or article or drawing the chart to define his axes.

    Let's start simple

    IF you look at a map flat on your table,
    most folks would agree East is positive direction in X,
    and North is positive direction in Y,
    and UP out of the map is positive direction in Z.

    is that any help ??
  5. Feb 13, 2012 #4


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    Staff: Mentor

    Welcome to the PF.

    Maybe this is a better picture to start with. Can you use this picture to state your question a little more clearly?

    http://www.mathworks.com/help/toolbox/phased/ug/rh_coordinate.gif [Broken]
    http://www.mathworks.com/help/toolbox/phased/ug/rh_coordinate.gif [Broken]
    Last edited by a moderator: May 5, 2017
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