Composite Trapezoid Rule

In mathematics, and more specifically in numerical analysis, the trapezoidal rule (also known as the trapezoid rule or trapezium rule) is a technique for approximating the In numerical analysis, the trapezoidal rule is used for approximation of a definite integral. The code here is a general purpose code for any equation.

MATLAB

function integral = trapezoidal(f, a, b, n)

   h = (b-a)/n;
   result = 0.5*f(a) + 0.5*f(b);
   for i = 1:(n-1)
       result = result + f(a + i*h);
   end
   integral = h*result;

end