title: Numerical integration over non-uniform Grids
body: <p>I have a function which I want to integrate. I have two numpy arrays, one with the <code>x</code>-values and one with the function <code>f(x)</code>. I am looking for a function <code>F(x)</code> which is the antiderivative of <code>f(x)</code>, defined on the same grid <code>x</code>. This grid <code>x</code> is <em>non-uniform</em>.</p>
  
  <p>Is there some numpy or scipy function giving me the array <code>F(x)</code>?</p>