[Tensor] narrow(dim, index, size)

Returns a new Tensor which is a narrowed version of the current one: the dimension dim is narrowed from index to index+size-1.

> x = torch.Tensor(5, 6):zero()
> print(x)

0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
[torch.Tensor of dimension 5x6]

> y = x:narrow(1, 2, 3) -- narrow dimension 1 from index 2 to index 2+3-1
> y:fill(1) -- fill with 1
> print(y)

 1  1  1  1  1  1
 1  1  1  1  1  1
 1  1  1  1  1  1
[torch.Tensor of dimension 3x6]

> print(x) -- memory in x has been modified!

 0  0  0  0  0  0
 1  1  1  1  1  1
 1  1  1  1  1  1
 1  1  1  1  1  1
 0  0  0  0  0  0
[torch.Tensor of dimension 5x6]