ワークフロー 7 ステップを1つのセッション内で順に実行します。各ステップはエンジンで実行済みで、以下の出力は実際に生成されたものです。
mat = Table[Subscript[m, i, j], {i, 5}, {j, 5}]{{Subscript[m, 1, 1], Subscript[m, 1, 2], Subscript[m, 1, 3], Subscript[m, 1, 4], Subscript[m, 1, 5]}, {Subscript[m, 2, 1], Subscript[m, 2, 2], Subscript[m, 2, 3], Subscript[m, 2, 4], Subscript[m, 2, 5]}, {Subscript[m, 3, 1], Subscript[m, 3, 2], Subscript[m, 3, 3], Subscript[m, 3, 4], Subscript[m, 3, 5]}, {Subscript[m, 4, 1], Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4], Subscript[m, 4, 5]}, {Subscript[m, 5, 1], Subscript[m, 5, 2], Subscript[m, 5, 3], Subscript[m, 5, 4], Subscript[m, 5, 5]}}MatrixForm[mat]MatrixForm[{{Subscript[m, 1, 1], Subscript[m, 1, 2], Subscript[m, 1, 3], Subscript[m, 1, 4], Subscript[m, 1, 5]}, {Subscript[m, 2, 1], Subscript[m, 2, 2], Subscript[m, 2, 3], Subscript[m, 2, 4], Subscript[m, 2, 5]}, {Subscript[m, 3, 1], Subscript[m, 3, 2], Subscript[m, 3, 3], Subscript[m, 3, 4], Subscript[m, 3, 5]}, {Subscript[m, 4, 1], Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4], Subscript[m, 4, 5]}, {Subscript[m, 5, 1], Subscript[m, 5, 2], Subscript[m, 5, 3], Subscript[m, 5, 4], Subscript[m, 5, 5]}}]Part[mat, 1, 2]Subscript[m, 1, 2]mat[[4]]{Subscript[m, 4, 1], Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4], Subscript[m, 4, 5]}mat[[All, 4]]{Subscript[m, 1, 4], Subscript[m, 2, 4], Subscript[m, 3, 4], Subscript[m, 4, 4], Subscript[m, 5, 4]}mat[[1 ;; 2, 1 ;; 3]]//MatrixFormMatrixForm[{{Subscript[m, 1, 1], Subscript[m, 1, 2], Subscript[m, 1, 3]}, {Subscript[m, 2, 1], Subscript[m, 2, 2], Subscript[m, 2, 3]}}]mat[[2 ;; -2, 2 ;; -2]]//MatrixFormMatrixForm[{{Subscript[m, 2, 2], Subscript[m, 2, 3], Subscript[m, 2, 4]}, {Subscript[m, 3, 2], Subscript[m, 3, 3], Subscript[m, 3, 4]}, {Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4]}}]