橫坐標 定義
In mathematics, the abscissa and the ordinate are respectively the first and second coordinates of a point in a coordinate system. The abscissa is the first coordinate in an ordered pair and the ordinate is the second coordinate. For instance with the point (3, 2) the abscissa is 3 and the ordinate is 2.
概述
The abscissa of a point is the signed measure of its projection on the primary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative; after: positive).
點的縱坐標是其在次軸上的投影的有符號度量，其絕對值是投影與軸原點之間的距離，其符號由投影上相對於原點的位置給出（之前：負；之後：正）。
通常這些是二維矩形笛卡爾坐標系統中一個點的水平和垂直坐標。這些術語也可以分別指代二維 graph 的水平軸和垂直軸（通常是 x 軸和 y 軸）。有序對由兩個項組成：橫坐標（水平，通常是 x）和縱坐標（垂直，通常是 y），它們定義了一個點在二維矩形空間中的位置。
來源
“Abscissa and Ordinate.” Wikipedia, Wikimedia Foundation, 6 Feb. 2020, en.wikipedia.org/wiki/Abscissa_and_ordinate.