In 2D or 3D graphics/physics/geometry, you rarely use vectors longer than 4 or matrix larger than 4x4. In that case, following Nim libraries would be more suitable than Arraymancer. <https://github.com/treeform/vmath> <https://github.com/stavenko/nim-glm>
I don't know much about Arraymancer, but it seems it is designed for large (> 100) vector/matrix. vmath/nim-glm uses only `array` to store data. So size of vector/matrix must be determined at compile time in vmath/nim-glm but size can be changed at runtime in Arraymancer. If you use `array`, data can be placed in stack or heap. Here is how nim-glm implements matrix-vector multiplication: <https://github.com/stavenko/nim-glm/blob/47d5f8681f3c462b37e37ebc5e7067fa5cba4d16/glm/mat.nim#L341> How nim-glm implements matrix[i, j] subscript operator: <https://github.com/stavenko/nim-glm/blob/47d5f8681f3c462b37e37ebc5e7067fa5cba4d16/glm/mat.nim#L51> # This proc implements matrix[i, j] = a. proc `[]=`*[M,N,T](v:var Mat[M,N,T]; ix, iy:int; value:T): void {.inline.} = # This proc implements a = matrix[i, j] proc `[]`*[M,N,T](v: Mat[M,N,T]; ix, iy: int): T {.inline.} = Run
