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I know how to simulate a 2d array in a linear array using [x + y * width] as a linear index.
I can extend this to 3d arrays: [x + y * width + z * width * height].
Is there a general formula for N-dimensional array?
I’m looking for a language-agnostic answer.
Sure. Just extending your example gives
x + y*width + z*width*height + w*width*height*depth + ...In other words,
dim1 + dim2*size1 + dim3*size1*size2 + dim4*size1*size2*size3 + ...