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

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    Projections
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Discussion Overview

The discussion revolves around the concept of projections, particularly in the context of linear algebra, and seeks to explore their applications in real-world scenarios. Participants express curiosity about how projections are utilized beyond theoretical problems.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses understanding of projections in theory but seeks clarification on their practical applications.
  • Another participant questions whether the inquiry pertains specifically to linear algebra or another area.
  • A participant suggests that projections relate to dot products but emphasizes a desire for concrete real-world examples.
  • Examples provided include the use of projections in maps and floor plans.
  • One participant describes the projection of weight on an inclined plane as a practical application of the concept.
  • Another participant mentions shadows and the geometric characteristics of 3-D objects as examples of projections in action.
  • A later reply introduces the idea that the entire field of trigonometry may be relevant to the discussion of projections.

Areas of Agreement / Disagreement

Participants generally agree on the theoretical understanding of projections but have differing views on specific applications and examples, indicating that the discussion remains unresolved regarding the breadth of practical uses.

Contextual Notes

Some assumptions about the definitions and contexts of projections may not be fully articulated, and the examples provided vary in their direct relevance to the original question.

jwj11
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[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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Do you mean in linear algebra? Or some other area?
 
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??
 
jwj11 said:
Any specific examples??
The map you carry in you car and the floor plan of your house, just to name a couple down-to-earth examples.
 
I don't get it =(
 
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.
 
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:
This might be an out-there idea, but have you considered the entire field of trigonometry?
 

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