Hands-on: Numerical integration

Source code for this exercise is located in numpy/integration/

A simple method for evaluating integrals numerically is by the middle Riemann
sum

[S = int_a^b f(x) dx = sum_{i=1}^n f(x’_i) Delta x]

with

[x’_i = (x_i + x_{i-1}) / 2 ; x_0 = a, x_n = b]

Calculate the integral in the interval [0,π/2] and investigate how much the
Riemann sum of sin differs from 1.0. Avoid for loops. Investigate also how the results changes with the choice of Δx.