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It is not clear why you need special functions to do what you want instead of using Drop. I think you should provide a minimum working example of your starting "matrix of matrix" and what you want the end result to be. In any case try this: m = Array[FromDigits[{##}] &, {3, 3, 4}] Drop[m, {2}] // MatrixForm Drop[m, None, {2}] // MatrixForm Edit ...

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