2>
		  <code>X = spgrid(N,D)</code> Computes the sparse grid points of level <code>N</code> and problem dimension <code>D</code>. The coordinate value of dimension <code>i = 1..d</code> is stored in column <code>i</code> of the matrix <code>X</code>. One row of the matrix <code>X</code> represents one grid point.
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      <code>X = spgrid(N,D,OPTIONS)</code> computes the sparse grid points as
     above, but with default grid type replaced by the grid type specified in <code>OPTIONS</code>, an argument 