1,41d0
< Input ds is  dataset[5,2] (dimensionless)
< ==ds[:,:]==
< it.rank()= 2  the rank of the result
< Iter [0:5,0:2] @ [0,0]  0.0
< Iter [0:5,0:2] @ [0,1]  1.0
< Iter [0:5,0:2] @ [1,0]  2.0
< Iter [0:5,0:2] @ [1,1]  3.0
< Iter [0:5,0:2] @ [2,0]  4.0
< Iter [0:5,0:2] @ [2,1]  5.0
< Iter [0:5,0:2] @ [3,0]  6.0
< Iter [0:5,0:2] @ [3,1]  7.0
< Iter [0:5,0:2] @ [4,0]  8.0
< Iter [0:5,0:2] @ [4,1]  9.0
< ==start stop iterator ds[0:3,:]==
< it.rank()= 2  the rank of the result
< Iter [0:3,0:2] @ [0,0]  0.0
< Iter [0:3,0:2] @ [0,1]  1.0
< Iter [0:3,0:2] @ [1,0]  2.0
< Iter [0:3,0:2] @ [1,1]  3.0
< Iter [0:3,0:2] @ [2,0]  4.0
< Iter [0:3,0:2] @ [2,1]  5.0
< ==singleton iterator ds[:,0]==
< it.rank()= 1  the rank of the result
< Iter [0:5,0] @ [0,0]  0.0
< Iter [0:5,0] @ [1,0]  2.0
< Iter [0:5,0] @ [2,0]  4.0
< Iter [0:5,0] @ [3,0]  6.0
< Iter [0:5,0] @ [4,0]  8.0
< ==singleton iterator ds[:,0]==
< it.rank()= 1  the rank of the result
< it.length(0)= 5  it.length(1)= 1
< it.index(0)= 0  it.index(1)= 0
< it.index(0)= 1  it.index(1)= 0
< it.index(0)= 2  it.index(1)= 0
< it.index(0)= 3  it.index(1)= 0
< it.index(0)= 4  it.index(1)= 0
< where is length() used?
< dataset[3,4,5] (dimensionless)
< Iter [0:3,0,0:5] @ [-1,0,-1] 
< it.rank()= 2  the rank of the result
< it.length(0)= 3  it.length(1)= 1  it.length(2)= 5 the number of iterations for each dimension