title: Matlab: Find area enclosed by points (x,y)
body: <p>I've got 8 points that create the outline of an eight-sided polygon in two-dimensional space. I need to find the area enclosed be these points, but how do I do that using matlab?</p>
  
  <p>The eight points (x,y) are contained in the 8x2 matrix B. </p>
  
  <pre><code>B = [ 260 455;
      1187 467;
      1325 605;
      1342 1533;
      1207 1675
      251 1690;
      107 1547;
      116 593];
  </code></pre>
  
  <p>The polygon is created by drawing straight lines from the point which is row 1 to row 2, then row 2 to row 3 and so on...</p>