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tensor
C++ library for numerical arrays and tensor objects and operations with them, designed to allow Matlab-style programming. (by juanjosegarciaripoll)
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InfluxDB
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I developed this library long ago coming from the Matlab world. It works with multidimensional arrays and provides convenience functions with Matlab conventions. The CMake branch on GitHub is currently being modernized for C++14 https://github.com/juanjosegarciaripoll/tensor/tree/cmake while the original branch was C++98 with Unix-based build tools
If you want 3D maths only (so up to 4x4) GLM https://github.com/g-truc/glm is perfect.