Implement local to global and global to local index mapping

xcompact3d / x3d2

https://xcompact3d.github.io/x3d2

BSD 3-Clause "New" or "Revised" License

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Implement local to global and global to local index mapping #64

Closed pbartholomew08 closed 5 months ago

pbartholomew08 commented 6 months ago

With the backend-dependent layout we should have a method(s) to obtain the local index in (i,j,k) and from that the global index (or vice-versa). This will enable users who need the Cartesian coordinates to get these without duplicate code.