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What are projections for? When do we need to use them?

  1. Feb 27, 2008 #1
    [SOLVED] What are projections for? When do we need to use them?

    I understand the concept of projections, and I can do problems that require it pretty easily. But I don't get what the applications of projections are? Can anyone tell me some.
     
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  3. Feb 27, 2008 #2

    EnumaElish

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    Do you mean in linear algebra? Or some other area?
     
  4. Feb 27, 2008 #3
    Yes, well for linear algebra i think projections are the same concept as dot products.... but I would like to know some real world applications of this concept. What is it used for?? Any specific examples??
     
  5. Feb 27, 2008 #4

    D H

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    The map you carry in you car and the floor plan of your house, just to name a couple down-to-earth examples.
     
  6. Feb 27, 2008 #5
    I don't get it =(
     
  7. Feb 27, 2008 #6

    HallsofIvy

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    If you are pushing a box up an inclined plane the "net force" you are pushing against is the projection of the weight vector (mg pointing straight down) on the plane.
     
  8. Feb 27, 2008 #7

    EnumaElish

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    Your shadow. Or, the shape of the area blocked from the light source when light is intercepted by a 3-D object with particular geometric characteristics.
     
    Last edited: Feb 27, 2008
  9. Feb 27, 2008 #8
    This might be an out-there idea, but have you considered the entire field of trigonometry?
     
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