Abscissa of a point or vector in the plane

### 25.12.2 Abscissa of a point or vector in the plane

See Section 26.10.1 for abscissas in three-dimensional geometry.

The abscissa command finds the abscissa (x-coordinate) of a point.

- abscissa takes P, a point.
- abscissa(P) returns the abscissa of P.

#### Examples

abscissa(point(1+2*i))

1 |  |  |  |  |  |  |  |  |  |

abscissa(point(i)-point(1+2*i))

−1 |  |  |  |  |  |  |  |  |  |

abscissa(1+2*i)

1 |  |  |  |  |  |  |  |  |  |

abscissa([1,2])

1 |  |  |  |  |  |  |  |  |  |