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Homework Help: Light bulb filament

  1. Apr 5, 2008 #1
    1. The problem statement, all variables and given/known data
    I want to modelling a light bulb filament in MATLAB, but I don't know, what functions describe this shape. My question is, what are equation (x,y,z) which describe the light bulb filament.
     

    Attached Files:

  2. jcsd
  3. Apr 5, 2008 #2
    If you just mean a spiral shape then something like (x,y,z)=(Sin(t),Cos(t),t) should work using a parametric plot (in mathematica anyway, I don't use matlab).
     
  4. Apr 5, 2008 #3
    I know that
    x=cos(t)
    y=sin(t)
    z=b*t
    these equation describe a simple spiral, but I want to drawing complicated shape, like in attachment.
     
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