Definition of coordinate system
Coordinate system refers to a geometric figure system composed of coordinate axes and coordinate planes. Coordinate axis refers to a set of straight lines composed of two mutually perpendicular number axes, one is the horizontal axis and the other is the vertical axis. Coordinate plane refers to a plane figure composed of horizontal axis and vertical axis.
Definition of longitudinal axis direction
In the coordinate system, the vertical axis direction refers to the direction perpendicular to the horizontal axis, also known as the Y axis direction. In Cartesian coordinate system, the vertical axis usually represents the ordinate of the dependent variable or variable, and the horizontal axis usually represents the abscissa of the independent variable or variable.
Characteristics of longitudinal axis direction
The longitudinal axis direction is the basic direction in the coordinate system and has the following characteristics:
(1) forms a rectangular coordinate system perpendicular to the horizontal axis;
(2) The numerical value on the vertical axis represents the dependent variable or the ordinate of the variable;
(3) The positive direction on the longitudinal axis is upward and the negative direction is downward;
(4) In the coordinate system, the vertical axis and the horizontal axis together describe a plane space, which can be used to describe the position, size and shape of two-dimensional graphics.
Application of longitudinal axis direction
In mathematics, physics, engineering and other disciplines, the vertical axis direction is often used to describe the dependent variable or ordinate of a variable, for example, in a function image, the vertical axis represents the output value of the function; In mechanics, the vertical axis represents the vertical force of an object; In geography, the vertical axis represents the altitude of the earth's surface.
In short, the longitudinal axis direction is a basic direction in the coordinate system, which is used to represent the ordinate of the dependent variable or variable. In mathematics, physics, engineering and other disciplines, the vertical axis direction is widely used.