Get sub-matrix starting at (row, col). Sizes parameters define (nrows, ncols) number of rows and number of columns. If len(sizes) is zero size is then (nrows, ncols) is (Rows()-row, Cols()-col).If len(sizes) is one then (nrows, ncols) is (sizes[0], Cols()-col) In all other cases (nrows, ncols) is (s
(row, col int, sizes ...int)
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