title: Error with spline2dbuildbicubic of alglib
body: <p>I want to make a bicublic 2D spline Interpolation. For that I opted for using the library Alglib. I have two vectors xs and ys and a matrix magnitudes. According to the docs I wrote this (magnitude is a  double[N,27]):</p>
  
  <pre><code>   for (int i = 0; i &lt; 27; i++)
   {
    ys[i] = i;
     }
    for (int i = 0; i &lt; N; i++)
   {
      xs[i] = i;
    }
  
     alglib.spline2dbuildbicubic(xs, ys,magnitudes,N, 27, out f);
  </code></pre>
  
  <p>I get the exception "alglib+alglibexception: Exception of type 'alglib+alglibexception' was thrown."</p>