Integration without using integration

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Discussion Overview

The discussion revolves around finding alternative methods to perform integration, specifically in the context of a formula involving double integration. Participants explore approaches suitable for implementation in Excel, given the limitations of VBA for direct integration.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant expresses difficulty with a specific integration formula and seeks a method to implement it in Excel without traditional integration techniques.
  • Another participant inquires about the boundaries of the area for integration, suggesting that it can be set arbitrarily.
  • A participant clarifies that the area of integration depends on the chosen differential area (dA) and involves summing values of the function over this area.
  • A different approach is proposed using a Monte Carlo method, where randomly distributed points are generated over the area, and the average of the function values at these points is multiplied by the area to approximate the double integral.
  • This Monte Carlo method is noted to rely on approximations, with accuracy improving as more points are used.

Areas of Agreement / Disagreement

Participants present multiple approaches to integration without consensus on a single method. The discussion remains open with various viewpoints on how to proceed.

Contextual Notes

The discussion highlights the dependence on the choice of area for integration and the limitations of using approximations in the Monte Carlo method.

isabella
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i'm having a problem with this integration formula..
f=(double integration cos a cos b)/(pi*d^2)dA

i have to insert this formula into an excel sheet but in excel to do integration i need to use an alternative way as the vba codes does not provide any formula for integration.
 
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What's the area of integration bounded by?
 
the boundary can be set on our own.
 
i mean it depends on the area that i chose (dA).i was told that this involves a summation of the values of F.the whole area is divided into many small areas(dA).
 
hello isabella

well to me a great way to do integration without using integration is most likely through a monte carlo approach, since we are dealing with double integrals we are trying to find the volume of a 3D shape, the Area you are talking about sounds like the base of this 3D shape now if you generated randomly distributed points over this area, and found the average of the function values at all these points and multiply it by the area of the base you will indeed find the solution to the double integral which is the volume of the 3 dimensional shape, but see this will all be based upon approximations and the more points you use the more accurate you anwser will be

steven
 

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