> a := Array( [ 1.1, 3.2, 5.7 ] );
                          a := [1.1, 3.2, 5.7]

> sqrt~( a );
                [1.048808848, 1.788854382, 2.387467277]

> a;
                            [1.1, 3.2, 5.7]

> map( sqrt, a );
                [1.048808848, 1.788854382, 2.387467277]

> a;
                            [1.1, 3.2, 5.7]