Numerical integration of double integrals in MAtlab
Asked by Himanshu on 9 Mar 2011
Latest activity Commented on by Walter Roberson on 9 Mar 2011
Hi,
I am trying to integrate an array of numbers in polar co-ordinates. I do not have a defined function for this array of numbers. How can I integrate the array of numbers numerically in matlab? Theta goes from 0 to 2*pi and R goes from 0 to 10.
Thank you, HT
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1 Answer
Answer by Matt Fig on 9 Mar 2011
Look at the TRAPZ function.
3 Comments
Walter Roberson on 9 Mar 2011
That sounded okay at first, under the assumption that the polar was converted to cartesian, but then I realized that in polar plots it is common for the same X cartesian coordinate to have multiple Y, which is a situation that trapz is not designed to handle.
Andrew Newell on 9 Mar 2011
It depends on what the problem is. If the problem is to integrate inside a curve on a polar plot, you're right. But I think the problem is really just to integrate a function like sin(x) given a set of values [x sin(x)].
Walter Roberson on 9 Mar 2011
Andrew, the OP stated that theta goes from 0 to 2*pi; as the range is greater than Pi, there must be overlapping X areas.
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