1 | initial version |

According to the tab completion, appart from the `.cartesian_product()`

method that will make a couple of vectors, there seem no direct way to do this.

You can have a look at this question and that question, though i would advise to keep track of the base ring of your initial vector as follows:

```
sage: v = vector(QQ,[0,1,2]) ; v
(0, 1, 2)
sage: v.parent()
Vector space of dimension 3 over Rational Field
sage: vv = v.list()
sage: vv.append(0.5)
sage: v = vector(v.base_ring(), vv) ; v
(0, 1, 2, 1/2)
sage: v.parent()
Vector space of dimension 4 over Rational Field
```

2 | No.2 Revision |

According to the tab completion, appart from the `.cartesian_product()`

method that will make a couple of vectors, there seem no direct way to do this.

You can have a look at this question and that question, though i would advise to keep track of the base ring of your initial vector as follows:

```
sage: v = vector(QQ,[0,1,2]) ; v
(0, 1, 2)
sage: v.parent()
Vector space of dimension 3 over Rational Field
```~~sage: vv = v.list()
sage: vv.append(0.5)
~~ sage: v = vector(v.base_ring(), ~~vv) ~~v.list() + [0.5]) ; v
(0, 1, 2, 1/2)
sage: v.parent()
Vector space of dimension 4 over Rational Field

3 | No.3 Revision |

According to the tab completion, appart from the `.cartesian_product()`

method that will make a couple of vectors, there seem no direct way to do this.

You can have a look at this question and that question, though i would advise to keep track of the base ring of your initial vector (if needed) as follows:

```
sage: v = vector(QQ,[0,1,2]) ; v
(0, 1, 2)
sage: v.parent()
Vector space of dimension 3 over Rational Field
sage: v = vector(v.base_ring(), v.list() + [0.5]) ; v
(0, 1, 2, 1/2)
sage: v.parent()
Vector space of dimension 4 over Rational Field
```

4 | No.4 Revision |

`.cartesian_product()`

method that will make a couple of vectors, there seem no direct way to do this.

You can have a look at this question and that question, though i would advise to keep track of the base ring of your initial vector (if needed) as follows:

```
sage: v = vector(QQ,[0,1,2]) ; v
(0, 1, 2)
sage: v.parent()
Vector space of dimension 3 over Rational Field
sage: v = vector(v.base_ring(), v.list() +
```~~[0.5]) ~~[QQbar(1/2)]) ; v
(0, 1, 2, 1/2)
sage: v.parent()
Vector space of dimension 4 over Rational Field

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