Performs the element-wise division of self by tensor. The number of elements must match, but sizes do not matter. 

> x = torch.Tensor(2,2):fill(1)
> y = torch.Tensor(4)        
> for i=1,4 do y[i] = i end
> x:cdiv(y)
> = x

 1.0000  0.3333
 0.5000  0.2500
[torch.Tensor of dimension 2x2]