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Homework Help: Tips for skecthing 3D functions?

  1. Apr 19, 2008 #1
    1. The problem statement, all variables and given/known data

    im having problems on how to sketch 3D functions, like z=4-x-y, any tips or website that gives a summary and useful techniques to graph functions like this?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 19, 2008 #2
    -Use Matlab :wink:
    -make either x or y = 0 and then find how the thing looks in z-y or z-x plane
    -find what happens when x--> inf y=0 or y--> inf , x =0 or y-->inf x -->inf
    -Draw contours (should have learned them before getting into 3d)
  4. Apr 19, 2008 #3
    I agree with rootx. plotting the functions when x or y = 0 is a good tool.
  5. Apr 19, 2008 #4
    I still don't quite understand contours :(
  6. Apr 19, 2008 #5
    neither me ><
    using k = 0,1,2.. works most times..
    sometimes, using z-x and z-y plane
    or, converting to rec/spherical co-ods
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