This is a simple example program that shows how to use the transpose_blocks
function of the igl library


To Build:
  make

To Run:
  ./example
which should produce
  A=[
    0   1   2   3
    4   5   6   7
  100 101 102 103
  104 105 106 107
  200 201 202 203
  204 205 206 207
  ];
  B=[
    0   4
    1   5
    2   6
    3   7
  100 104
  101 105
  102 106
  103 107
  200 204
  201 205
  202 206
  203 207
  ];