## ,. y (Ravel Items)

Ravels (,) each item in a list.

Converts an atom to a 1-entry list, the entry being the atom ravelled.

• the result is a 1-by-1 matrix.

```   \$ 'a'

\$ ,.'a'
1 1

,.i.6
0
1
2
3
4
5
\$ ,.i.6
6 1```

## x ,. y (Stitch)

Stitch two lists, item-by-item.

Append an atom to each item of a list.

```   z=: i.6
z,.99
0 99
1 99
2 99
3 99
4 99
5 99
z,. -z
0  0
1 _1
2 _2
3 _3
4 _4
5 _5```

### Common uses

1. Appending a column to a matrix:

```   ]z=: 3 5 {. i.10 10          NB. sample noun
0  1  2  3  4
10 11 12 13 14
20 21 22 23 24

z,.99
0  1  2  3  4 99
10 11 12 13 14 99
20 21 22 23 24 99

99,.z
99  0  1  2  3  4
99 10 11 12 13 14
99 20 21 22 23 24```

2. Appending a space (or other character) to each line of a literal matrix:

```   \$ z=: > 'this' ; 'is' ; 'a' ; 'matrix'
4 6
z
this
is
a
matrix

' ',.z
this
is
a
matrix```

3. Joining two matrices along the last dimension:

```   z,. -z
0  1  2  3  4   0  _1  _2  _3  _4
10 11 12 13 14 _10 _11 _12 _13 _14
20 21 22 23 24 _20 _21 _22 _23 _24```