How to select rows, columns, and elements¶

Select rows from a matrix¶

      M ← 4 5⍴⍳20
      2 ⌷ M                     ⍝ row 2
      1 3 ⌷ M                   ⍝ rows 1 and 3
      M[2;]                     ⍝ bracket indexing equivalent

Select columns from a matrix¶

      3 (⌷⍤0 1) M               ⍝ column 3
      2 4 (⌷⍤1) M               ⍝ columns 2 and 4
      M[;3]                      ⍝ bracket indexing equivalent

Select a single element¶

      3 ⌷ 2 ⌷ M                 ⍝ row 2, column 3 using From
      M[2;3]                     ⍝ bracket indexing equivalent

Select a rectangular cross-section¶

      2 4 (⌷⍤1) 1 3 ⌷ M        ⍝ rows 1,3 × columns 2,4
      M[1 3; 2 4]               ⍝ bracket indexing equivalent

See also: Indexing with From for a full explanation.