title: matlab/octave plot a mesh
body: <pre><code>t=0:0.01:2;
  alpha=linspace(0, 1, 41);
  r=linspace(0,1,41);
  [aa,rr] = meshgrid(alpha,r);
  </code></pre>
  <p>At each point of (aa, rr), for each t there is a value t^aa+rr^2, then those values are summed up:</p>
  <pre><code>sum = (t1^aa+rr^2) + (t2^aa+rr^2) + ...
  </code></pre>
  <p>Thus for each point of (aa,rr), there is a number of sum. How do you plot that mesh?</p>