Value parameters and variable parameters, the difference between parameters and variables

To be clear, only"Value parameters and variable parameters"How can I help you?

Parameter is short for parametric variable. It arose from the study of a class of problems such as movement. When a particle moves, its position must be related to time, that is, there is a functional relationship between the coordinates x,y and time t of the mass x=f(t),y=g(t), and the variable t in these two functions is a "participating variable" relative to the variable x,y that represents the geometric position of the particle.

Parametric variables in such practical problems.

When abstracted into mathematics, it becomes a parameter. The parametric equations we learned.

The task is to communicate the connections between the variables x, y and some constants, so as to facilitate the study of the shape and properties of curves.

When describing the laws of motion with parametric equations, it is often more straightforward and simple than using ordinary equations. It is ideal for solving a series of problems such as finding the maximum range, maximum altitude, flight time or trajectory. Some important but complex curves, such as the involute of a circle, are difficult or even impossible to establish by ordinary equations, and the equations listed are complex and difficult to understand.

Drawing curves from equations is time-consuming; It is often easier to use parametric equations to indirectly link two variables x and y, and the equations are simple and clear, and the diagram is drawn.

It's also not too difficult.

First, the reference is different.

1. Parameters: Introduce one or some other variables to describe the changes between the independent variable and the dependent variable, and the introduced variable is not the variable that must be studied in the current problem.

2. Variable shouting delay: It is an abstract concept that can store calculation results or represent values in computer language.

Second, the characteristics are different.

1. Parameters: Parameters can be of any type.

2. Variables: can be accessed through the variable name. In imperative languages, variables are usually mutable; But in a purely functional language (such as haskell), variables can be immutable.

Third, the effect is different.

1. Parameter: The scope is within the method of transferring the parameter, which belongs to the local scope.

2. Variable: determined by the position in which it is declared. If a variable is declared in a procedure, only ** in the procedure can access or change the variable value, in which case the variable has a local scope and is referred to as a process-level variable.

If a variable is declared outside of the procedure grip, the variable can be recognized by all processes in the script and is called a script-level variable with a script-level scope.

Mathematics. for a specific purpose or process.

A variable that takes a fixed value under a given condition. Also known as parametric variables or parameters. If the coordinates x and y of the moving point are represented by the function of another variable t; x= (t), y (t), for all t values in a certain range, such a moving point forms a curve c; Conversely, for any point on the curve c (x,y), there must be a value of t so that x= (t),y p(t) satisfies it.

In this way, we call x= (t) and y (t) the parametric equations of the curve c.

The variable t is called a parameter, or parameter. For example, the parametric equation for a straight line on a plane is usually expressed as: x x0 nty yo mt.

The parametric equation can be used not only to represent curves, but also to express the functional relationship between x and y by the equations x= (t), y= (t). Parametric equations originate from mechanics and physics, for example, most equations of motion use parametric equations, where the parameter t often represents the variable time.

A parameter, also called a parameter, is a variable. When we study the problem at hand, we are concerned with the changes in certain variables and the interrelationships between them, one or some of which are called independent variables, and the other or others are called dependent variables. If we introduce one or more variables to describe the change between the independent variable and the dependent variable, the introduced variable is not the variable that must be studied in the current problem, and we call such a variable a parameter or parameter.

English name: parameter.

A variable is the amount that affects the results of the program's operation. A parameter is an input to a function that affects the execution result of the function.

A variable can be a parameter, and a parameter is a type of variable.

The parametric equation for the ellipse x2 a2+y2 b2=1(a>b>0) is x=acos and y=bsin ( is the parameter).

The parametric equation for hyperbola x2 a2-y2 b2=1(a>0,b>0) is x=asec and y=btg (is parameter).

The parametric equation for the parabolic y2=2px is x=2pt2, y=2pt(t is the parameter) of the polar parametric equation for the curve =f(t), g(t).

The parametric equation of the circle x=a+r cos y=b+r sin ( 0,2 ) a,b) is the coordinate of the center of the circle, r is the radius of the circle, is the parameter, and (x,y) is the coordinate of the passing point.

1.A parameter, also known as a parametric variable, is a variable. When we look at the problem at hand, we focus on the changes in certain variables and their interrelationships.

One or some of them are known as independent variables, and the other or others are known as dependent variables. If we introduce one or some other variables to describe the change in the independent and dependent variables, the variables that are introduced are not the variables that must be studied in the current problem. We call such a variable a parameter, a variable or a parameter.

2.Parameter is an option that can be used for many mechanical setups or maintenance. It is literally understood as reference data, but sometimes it is not exactly data.

For a given application, it may be a given constant value; In general, it can be a variable that controls other quantities that change as it is registered.

3.A general numerical measure that describes the characteristics of a population, and is what researchers want to know about the characteristics of the population. The total unknown index is called a parameter.

My understanding is:

Parametric is characterized by full-scale constraints, full data correlation, and this form of modeling is dimensionally driven by design.

Because the full-scale constraints of parametric can interfere with and restrict the creativity and imagination of designers, the subsequent variable technology is a solid modeling technology that has always been more advanced than the parametric technology.

The variable technology allows the existence of under-constraints in the process of modeling, giving designers greater autonomy and room to exert their imagination.

A variable is the amount that affects the results of the program's operation. A parameter is an input to a function that affects the execution result of the function.