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So I'm working on a matlab function that uses simpsons 1/3 rule to find an integral.

This is what I have done so far, but I'm not 100% confident.. I seem to get double when I use greater segments.

If anyone would be able to have a look at give me some tips that would be very much appreciated.

function [ I ] = simpsons3( func,a,b,n )

%Finds estimate integral from a to b of function using simpson 1/3 rule

% % INPUTS

% % func = function

% % a = lower limit

% % b = upper limit

% % n=number of segments used for integration

% % OUTPUTS

% % I = integral estimate

h = (b-a)/(n-1);

sumE = 0;

for i = a+2*h:h:b-2*h

sumE = sumE + func(i);

end

sumO = 0;

for i = a+h:h:b-h

sumO = sumO + func(i);

end

I = (h/3)*(func(a)+4*sumE+2*sumO+func(b));

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# Composite Simpsons 1/3 matlab code

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