Returns a new Tensor which is a tensor slice at the given index in the dimension dim. The returned tensor has one less dimension: the dimension dim is removed. As a result, it is not possible to select() on a 1D tensor. 

> 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:select(1, 2):fill(2) -- select row 2 and fill up
> print(y)

 2
 2
 2
 2
 2
 2
[torch.Tensor of dimension 6]

> print(x)

 0  0  0  0  0  0
 2  2  2  2  2  2
 0  0  0  0  0  0
 0  0  0  0  0  0
 0  0  0  0  0  0
[torch.Tensor of dimension 5x6]

> z = x:select(2,5):fill(5) -- select column 5 and fill up
> print(z)

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

> print(x)

 0  0  0  0  5  0
 2  2  2  2  5  2
 0  0  0  0  5  0
 0  0  0  0  5  0
 0  0  0  0  5  0
[torch.Tensor of dimension 5x6]