How Can We Numerically Integrate an Oscillatory Function Over a Large Interval?

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Discussion Overview

The discussion revolves around the numerical integration of an oscillatory function over a large interval, specifically the integral of \(7\pi^{13}\sin(x^4)\) from \(3\pi e\) to \(73\pi e\). Participants explore various numerical methods and approaches to tackle this integral, with a focus on advanced techniques and the implications of the constants involved.

Discussion Character

  • Exploratory
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant requests methods and steps for numerically integrating the specified oscillatory function, emphasizing the need for comparison with their own numerical method.
  • Another participant questions the necessity of the constants used in the integral, suggesting that they complicate the problem unnecessarily.
  • Concerns are raised about the intractability of the function over a broad range, with a suggestion to consider Monte Carlo techniques as a potential approach.
  • Some participants propose examining shorter periods of the function to identify symmetries that could simplify the integration process.
  • There is a disagreement regarding the interpretation of the integral's behavior, with one participant asserting that certain parts may contribute zero to the integral, while another challenges this assertion and insists on the validity of their proposed integral.
  • Participants engage in a discussion about the appropriateness of the language and tone used in the conversation, with reminders about maintaining respect in the discourse.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to the integral or the relevance of the constants involved. Multiple competing views remain regarding the complexity of the integral and the methods to be employed.

Contextual Notes

Some participants express uncertainty about the implications of the constants in the integral and the overall complexity of the function over the specified range. There are unresolved questions about the effectiveness of proposed numerical methods and the potential for simplification through symmetry.

Who May Find This Useful

This discussion may be of interest to those exploring numerical integration techniques, particularly in the context of oscillatory functions, as well as individuals interested in the nuances of mathematical discourse and problem formulation.

  • #31
MarkFL said:
Take a look around the forums again, you will see that the vast majority of people who ask questions show what they have tried so far, and those that don't are encouraged to do so.

Your case is different though...you are (presumably) not asking for help with a homework problem, you are wanting to see how others would approach a problem in elementary numerical analysis.

I am assuming you are perhaps looking for ways to improve your own method. It would make more sense for you to demonstrate your approach so that others might offer you insights into how you might accomplish this.

hello,,,,,,,,,,,,,,,,,

I want to compare my method and style,,,, if I Realize That the numerical method of you is better than mine, I simply do I give up and will not work more,,, so I wanted to know how you solved it, ,,, the question for me is not a homework task is not,,,,,

so far it Appears That the numerical method what i designed and created by me is the only and the best so far yet,,,,,,, since no one else has been Able to make any approximation methods using own or of other mathematicians,,,,,, i will wait to see That goes with This Proposed of exercise,,,,,,,,,,,,att
jefferson alexander vitola(Bigsmile)
 
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  • #32
We are getting nowhere fast here. I am closing this topic. If you wish to discuss this further, send your work via PM to one of the administrators or global moderators, and we will consider reopening the topic for further discussion.

edit: There is a substantial literature on numerical methods for oscillatory integrals, so you might want to try google.
 

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