[eigen] Eigen for n-dimensional matrices/array

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Hi there,

It's still cumbersome to work with more-than-1-dimensional (numeric) arrays in C++. Convenient allocation or indexing is not possible in C++ itself. Not to mention things like slicing...

Eigen is a very helpful library to make it easier. I just wonder: Why does Eigen only support 2 D arrays/matrices? Even in linear algebra, for example in Matlab or NumPy one sometimes use things like a "stack of matrices" or a 3 D image.

Is it somehow possible/planned to handle n-D matrices/arrays?

Best regards,

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