I wish to update my question. Based off the answer provided, I tried ArrayFlatten for the following: 𝐴 is a 4×2 matrix, 𝐵 is a 4×4 matrix, and 𝐶 is a 4×6 matrix. I tried this to construct a 4×12 matrix: X = ArrayFlatten[{A,B,C}] However, Dimensions[X] returns 3×4 in my notebook instead of 4×12. What … Continue reading "How to assemble matrices (updated)"
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