a.singleToIndices (5, idx1);
System.out.println (idx1[0]+" , "+idx1[1]);
int[] trueIdx = new int[] {1, 2};
assertTrue (Arrays.equals (trueIdx, idx1));
assertEquals (5, a.singleIndex (idx1));
assertEquals (10.0, a.value (idx1), 1e-12);
}
public void testIndexing3d ()
{