How to transpose?

[grothesque]

In current mdarray, is it possible to perform a (generalized) transpose operation, i.e. change the order of dimensions without copying the data?

Since a strided layout is supported this should be technically possible.

[fre-hu]

See the reorder, reorder_mut and into_reordered methods. Are they what you mean?

[grothesque]

Ah, I didn't find this one since I was searching for "Strided" on the documentation page for Slice.

Yes, this solves this provides transpose, but actually for my own project I need general reordering of dimensions. Technically this is possible with mdarray, right? Is it just a matter of writing a function, or would that need some reorganization of types as well?

[fre-hu]

There are functions for general permutations also (permute/permut_mut/into_permuted). Like the view functions they are implemented for fixed rank, so you might have issues with dynamic rank. Maybe the interface for all of these should be updated in some way.

Yes, you can also write a standalone function that uses View::new_unchecked with the pointer and a new mapping from StridedMapping::new. For dynamic rank you don't need any reorganization of types.

[grothesque]

Thanks!

IMHO the view/permute interface should be either (eventually) updated, or the dynamic rank removed. It feels incomplete in the current state. See #7 for my thoughts. No idea if/how C++ mdarray handles the dynamic rank case.

(BTW I hate to use the term rank for number of dimensions, because for me the rank of a matrix is something different. But I see that C++ mdarray uses the same term, and also it's compact.)