message: fixed minor thing which shouldnt be a problem anyway
diff: @@ -33,8 +33,8 @@ fn rosenbrock_hessian(x: &Array1<f64>) -> Array2<f64> {
  // hacky...
  let mut out = Array2::eye(2);
  out[(0, 0)] = bla[0];
  - out[(0, 1)] = bla[2];
  - out[(1, 0)] = bla[1];
  + out[(0, 1)] = bla[1];
  + out[(1, 0)] = bla[2];
  out[(1, 1)] = bla[3];
  out
  }
  