Views on tensor, aka subtensor

[dmenendez-gruposantander]

Hi,
I can't find in the documentation how to create a "view" or "subtensor" over an existing tensor.

For example, if I interpret a rank 3 tensor as a "sequence" of 2D matrix-like rank 2 subtensors, I'd like to be able to iterate though each element in that sequence and pass it to a function expecting that rank 2 "subtensor".

How can I do that?

[bassoy]

Creating views of tensors (subtensor) is in development, see also https://github.com/boostorg/ublas/tree/features/subtensor.

The UI might look something like this:

// create tensor
auto A  = ublas::tensor{3,4,2};
// create view 
auto V = A ( {1,2}, {1,4}, {1,2} );
// iterate using std library
std::for_each(V.begin(), V.end(), lambda);
// or iterate using ublas library (faster than using std::for_each)
ublas::for_each(V.begin(3),V.end(3), lambda);