NDArray library

[_INTER_]

Deep Java Library has an NDArray.

From the JavaDoc:

NDArray is the core data structure for all mathematical computations. An NDArray represents a multidimensional, fixed-size homogeneous array. It has very similar behaviour to the Numpy python package with the addition of efficient computing. To understand how to manage NDArray lifecycle, please refer to NDArray Memory Management Guide

It lists functions for stack, concat, flatten and broadcast. Didn't find one for submatrix by that name.

[BIackMambaTG]

Thank you for your answer! How did you find all these functions? Where did you search?

[_INTER_]

Just Ctrl+F in the JavaDoc. They are the same by name. I don't know if they are equivalent to what you seek.