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Numerical Integration of Equally Spaced Data

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David Koenig
David Koenig 2013-5-20
I have been using trapz to integrate a vector of equally spaced data. Is there a more accurate method available in script form that carries out the Simpson's method or perhaps the Newton-Cotes method? Thanks.

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Youssef Khmou
Youssef Khmou 2013-5-20
hi David,
I think using trapz integrator with the x/t axis gives good result, in the mean wile try to interpolate your data to get better accuracy , as this example :
t=0:1/100:pi/2;
y=sin(t);
f=trapz(t,y);
t2=interp(t,4);
y2=sin(t2);
f2=trapz(t2,y2) % Df=1.0064-0.9992=0.0072
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David Koenig
David Koenig 2013-5-20
Thanks, Youssef. I will give your idea a try.
Youssef Khmou
Youssef Khmou 2013-5-20
编辑：Youssef Khmou 2013-5-20
ok, do not accept the answer until it works to get other suggestions from other contributors

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