Functions in Calculus textbook do not reflect behavior in Nature

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Discussion Overview

The discussion centers around the challenges of modeling real-world phenomena using mathematical functions learned in calculus. Participants express concerns about the applicability of textbook functions to natural behaviors and seek guidance on how to develop effective modeling skills.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant expresses anxiety about applying calculus concepts to real-world situations, noting a disconnect between textbook functions and natural behaviors.
  • Another participant mentions their background in electrical engineering, indicating a desire for a general approach to modeling rather than merely applying existing equations.
  • It is suggested that there is no universal algorithm for creating models that accurately represent the complexities of the real world, and that many resources exist for established models.
  • A participant questions whether the difficulty lies in the nature of finding functions for real-world data or if it is a matter of personal understanding.
  • Another participant elaborates on the theoretical physics aspect, explaining that modeling involves making assumptions and creating mathematical representations that can predict outcomes based on data, highlighting the distinction between fitting data and making reliable predictions.
  • An example is provided about fitting a line to two data points, raising questions about the reliability of such a model for additional data points.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the ease or difficulty of finding functions that represent real-world data. There are multiple competing views regarding the nature of modeling and the challenges involved.

Contextual Notes

Limitations include the lack of a clear algorithm for modeling, dependence on assumptions made during the modeling process, and the unresolved nature of how well models can predict future data points.

Who May Find This Useful

Students and professionals in fields such as physics, engineering, and mathematics who are interested in the practical application of calculus to real-world data and modeling challenges.

neg_ion13
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Hopefully this isn't a foolish question but, I am up to CalcII and am anxious to apply what I've learned but have found nature fails to provide functions for it's behaviour like textbooks do. Is there a book or something I can read to develop this skill?
 
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Electricity & Magnetism; upper division and some lower division Physics courses.
 
I'm an electrical engineering student so I don't think that will be a problem. I am looking for a general approach to modeling. IE what to do after you have collected data. I don't want to just plug things into equations I want to be able to take anything I come across and try to model it mathematically
 
this is much more difficult problem than you think. there is no general algorithm that tells you how to devise a model that approximates the world. there are many books that tell you how to model things that have already been figured out though.
 
Is that to say it is diffucult to find a function that represents collected real world data and it's not just that I have missed something?
 
neg_ion13 said:
Is that to say it is diffucult to find a function that represents collected real world data and it's not just that I have missed something?

you're basically talking about theoretical physics here where people take a bunch of data, think about the phenomena they represent, make a couple of assumptions, make up some math that is closely in accord with that data and then make predictions using that math. if their predictions come true then their model is good.

so finding a function that represents a bunch of data maybe difficult or easy but whether you can use that function to make predictions is a completely different game.

for example take two data points. i can always find a line that contains those two data points. will other data points from that process also lie on that line?
 

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