Numerical methods that need a guess/approximate solutions

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Discussion Overview

The discussion revolves around numerical methods for solving ordinary differential equations (ODEs) and partial differential equations (PDEs), particularly focusing on methods that can utilize approximate solutions to enhance accuracy. Participants explore various approaches, including the use of analog computers and the least action principles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about numerical methods that can take approximate solutions and improve them for time-dependent ODEs/PDEs, particularly in the context of using an analog computer.
  • Another participant suggests that applications of the least action principles could potentially expedite the search for exact solutions from approximate ones, particularly in chaotic systems.
  • A participant expresses curiosity about the popularity of least action principles as a numerical solver for ODEs and requests more details about the code used for searching periodic orbits in chaotic systems.
  • A different participant presents a specific differential equation and mentions challenges in obtaining a numerical solution due to complex numbers, seeking a program that can estimate complex plots and numbers.

Areas of Agreement / Disagreement

Participants do not reach a consensus on specific numerical methods, and multiple competing views and approaches are presented without resolution.

Contextual Notes

Some limitations include the lack of clarity on the applicability of least action principles in this context and the specific requirements for the numerical methods discussed. The discussion also highlights the challenges associated with complex solutions in differential equations.

Who May Find This Useful

Individuals interested in numerical methods for differential equations, particularly those exploring approximate solutions and chaotic systems, may find this discussion relevant.

Nate_CU
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Hello everyone! I am currently playing with an old analog computer, which could solve time-dependent ODE/PDEs pretty fast, without time-stepping. But the problem with analog computer's solutions is that they are not very accurate. I am very curious that is there any numerical method/solver which can take an approximate solution (over the time domain) to further process it, and generate a more accurate solution??

Thanks in advance!
 
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I can't think of any general ones, but applications of the least action principles should be able to search around an approximate solution to find an exact solution more quickly.

I've also written code for searching out periodic orbits of chaotic systems. Having approximations to begin with would make the process faster.
 
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Dr. Courtney said:
I can't think of any general ones, but applications of the least action principles should be able to search around an approximate solution to find an exact solution more quickly.

I've also written code for searching out periodic orbits of chaotic systems. Having approximations to begin with would make the process faster.
Dear Dr. Courtney,

Thanks for your reply! I have never heard of "least action principles" numerical solvers for solving ODEs. (Sorry about my weak math background!) Is this a popular way to solve ODEs?

Analog computers can also provide solutions of ODEs describing chaotic systems. Can you provide me more details on your codes? What initial information do you need to get started? Thank you!
 
hello every one
i have a differential equation:
Y''(x)+A*y(x)*(1+B*(y(x)^0.687))=0
i solve it numerically but i need a function for it unfortunately its give me complex number.
i need some program that can estimate complex plot and number
thank you
 

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