MATLAB 中的二维线图

“2D”代表二维，二维线是在二维中移动的线。 2D 中的一条线意味着我们可以向前和向后移动，也可以向左、右、上、下等任何方向移动。

在 MATLAB 中，我们有一个名为plot()的函数，它允许我们在 2 个方向上绘制一条线。

句法：

plot(X,Y)

where X and Y represent the x and the y axis of the plane. The X and Y both are can be vectors or matrices but there are some conditions to plot the graph and these conditions are mentioned below:

Condition 1: If X and Y both are vectors then they must be of equal length.

Condition 2: If X and Y both are Matrices then they must be of equal size.

Condition 3: If one of X or Y is a vector and the other is a matrix, then the matrix must have dimensions such that one of its dimensions equals the vector length. 

Condition 4: If one is a scalar and the other is either a scalar or a vector, then discrete points must be plotted.

现在让我们来看一些例子。

例 1：画一条简单的线：

MATLAB

% coordinates of the x-axis
x=[10,20,30,40,50]
 
% coordinates of the y-axis
y=[100,200,300,400,500]
 
% plot function is used to plot the
% line according to the coordinates
plot(x,y)
   
% to put grid on the graph
grid on

输出 ：

示例 2：绘制一条只有 1 个轴坐标作为输入的线：

注意：如果您只给出 1 个轴，则 plot()函数会将其作为 y 轴的坐标，并且默认情况下为 x 轴提供从 1、2、3 到 y 坐标的值。

MATLAB

% coordinates of axis
y=[100,200,300,400,500]
 
% plot function is used to plot the
% line according to the coordinates
plot(x,y)
 
% to put grid on the graph
grid on

输出 ：

示例 3：在具有轴名称的同一图形上绘制 1 条以上的线：

MATLAB

% coordinates of x-axis
x=[10,20,30,40,50]
 
% coordinates of y-axis of line 1
% represented by blue color
y1=[100,500,200,100,0]
 
% coordinates of y-axis of line 2
% represented by red color
y2=[400,100,0,200,300]
 
% coordinates of y-axis of line 3
% represented by yellow color
y3=[200,300,400,100,500]
 
% plot function to plot the lines on graph
plot(x,y1,x,y2,x,y3)
 
% to add grid on graph
grid on
 
% name of x axis
xlabel('x')
   
% name of y axis
ylabel('y')

输出 ：

示例 4：现在 y 轴的值作为矩阵而不是向量给出：

MATLAB

% coordinates of x-axis
x=[1,2,3,4,5]
 
% coordinates of y-axis in form of matrix
% magic(n) matrix is a n*n matrix
% in which value scattered from 1 to n^2
% with equal row and columns sum
y=magic(5)
 
% plot function
plot(x,y)
 
% to add grid
grid on
 
% add name on axis
xlabel('x')
ylabel('y')

输出：

示例 5：现在我们使用 2 y 轴绘制图形，一个在左侧，另一个在右侧。

MATLAB

% coordinates of x-axis
x=[1,2,3,4,5]
 
% coordinates of y-axis
y=[50,40,30,20,10]
 
% assigning left side to the above
% coordinates
yyaxis left
 
% plot graph of left y-axis
plot(x,y)
   
% coordinates of y-axis
y=[10,20,30,40,50]
 
% assigning right side to the above
% coordinates
yyaxis right
 
% plot graph of right y-axis
plot(x,y)
 
% put grid on graph
grid on
 
% name of x-axis
xlabel('x')
   
% name of left side y coordinates
yyaxis left
ylabel('Left Side')
   
% name of right side y coordinates
yyaxis right
ylabel('Right Side')

输出：