Eigen Tensor support

[pratikunterwegs]

Hi - this package came along right in time for a requirement we have at RESIDE-IC for using {cpp11} with Eigen for epidemic modelling - so very useful, thanks!

We're looking to expand a model using Eigen Tensors. I couldn't see Tensor among the libraries in the unsupported directory - is there any chance of that being added in the near future? I wouldn't need to be able to say, read R arrays directly to Tensors as with as_Matrix(),, but only to use them internally on the C++ side.

I don't have a good sense of what adding Tensor support would involve, but if it's relatively straightforward and mostly a matter of time investment, I'm happy to try to take it on (with the caveat of no experience vendoring established libraries in an R package).

[pachadotdev]

Hi - this package came along right in time for a requirement we have at RESIDE-IC for using {cpp11} with Eigen for epidemic modelling - so very useful, thanks!

We're looking to expand a model using Eigen Tensors. I couldn't see Tensor among the libraries in the unsupported directory - is there any chance of that being added in the near future? I wouldn't need to be able to say, read R arrays directly to Tensors as with as_Matrix(),, but only to use them internally on the C++ side.

I don't have a good sense of what adding Tensor support would involve, but if it's relatively straightforward and mostly a matter of time investment, I'm happy to try to take it on (with the caveat of no experience vendoring established libraries in an R package).

Thanks a lot!

You are asking about something similar to field in cpp11armadillo.

As you can see here, cpp11armadillo is much more documented https://pacha.dev/cpp11armadillo/articles/matrix-vector-cube-and-field-classes.html?q=field#field-class

I can try to add a new method to pass a list of matrices to a tensor in cpp11eigen, would that work?

[pratikunterwegs]

You are asking about something similar to field in cpp11armadillo.

I can try to add a new method to pass a list of matrices to a tensor in cpp11eigen, would that work?

Thanks, I'm actually looking for n-dimensional arrays on which I can do mathematical operations which would be Armadillo's Cube class.

So what I would find useful is for the Eigen Tensor library to be added to {cpp11eigen}, similarly to how it can be used from {RcppEigen} by linking to <unsupported/Eigen/CXX11/Tensor>. I'm open to considered switching to Armadillo ( I've seen your preprint), but with more experience using Eigen I'd like to stick with that if possible.

Again, I'm open to helping out where possible.

[pachadotdev]

hi @pratikunterwegs

I was able to implement an integration for the Tensor (Cube) class.

I will add tests and push the changes.

[pratikunterwegs]

Hi @pachadotdev - thanks a bunch! Looking forward to it.

[pachadotdev]

@pratikunterwegs hi! sorry the delay, I had a snow-related accident that put me on medical leave for many weeks. I slowly started retaking things this week. I should be back to this thread in a few days.

[pratikunterwegs]

Hi @pachadotdev - thanks for getting back to me on this; sorry to hear about your accident. There's no rush on this, and the offer of any help needed still stands.

[pachadotdev]

Hi @pachadotdev - thanks for getting back to me on this; sorry to hear about your accident. There's no rush on this, and the offer of any help needed still stands.

I would appreciate any help :)

[pratikunterwegs]

Sure - what would be the best way to help? Feel free to tag me or @richfitz (RESIDE lead) if you need PR reviewers or feedback and we'll do what we can.