# join!

**Syntax**

join!(X, Y)

**Arguments**

X is a vector/matrix/table.

Y is a scalar/vector/matrix/table.

If X is a vector, Y is a scalar/vector; if X is a matrix, Y is a vector/matrix; if X is a table, Y is a vector/table.

**Details**

Merge X and Y, and assign the result to X. The resulting object has the same data type as X.

**Examples**

If X is a vector, Y must be a scalar/vector. The result is a vector.

```
$ x=[1,2,3]
$ x.join!(4)
$ x;
[1,2,3,4]
$ x.join!(5 6 7)
$ x;
[1,2,3,4,5,6,7]
```

If X is a matrix, Y must be a vector/matrix with the same number of rows as X. The result is a matrix with the same number of rows as X.

```
$ x=1..6$2:3
$ join!(x, [7,8])
$ x;
```

#0 |
#1 |
#2 |
#3 |
---|---|---|---|

1 |
3 |
5 |
7 |

2 |
4 |
6 |
8 |

```
$ x.join!(9..12$2:2)
$ x;
```

#0 |
#1 |
#2 |
#3 |
#4 |
#5 |
---|---|---|---|---|---|

1 |
3 |
5 |
7 |
9 |
11 |

2 |
4 |
6 |
8 |
10 |
12 |

If X is a table, Y must be a table or a vector with the same number of rows as X. The result is a table with the same number of rows as X.

```
$ a=table(1..3 as x, 4.5 6.7 8.5 as y);
$ a;
```

x |
y |
---|---|

1 |
4.5 |

2 |
6.7 |

3 |
8.5 |

```
$ b=table(700 500 800 as z);
$ b;
```

z |
---|

700 |

500 |

800 |

```
$ join!(a,b);
$ a;
```

x |
y |
z |
---|---|---|

1 |
4.5 |
700 |

2 |
6.7 |
500 |

3 |
8.5 |
800 |

```
$ a=table(1..3 as x, `IBM`C`AAPL as y);
$ b=table(172.3 25 106.5 as z);
$ a.join!(b);
$ a;
```

x |
y |
z |
---|---|---|

1 |
IBM |
172.3 |

2 |
C |
25 |

3 |
AAPL |
106.5 |