2D Line Plot in MATLAB
‘2D’ stands for 2-dimensional and a 2D line is a line that is moved in 2-dimensions. A line in 2D means that we could move in forward and backward direction but also in any direction like left, right, up, down.
In MATLAB we have a function named plot() which allows us to plot a line in 2 directions.
Syntax:
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.
Now let’s move to some examples.
Example 1: Draw a simple line:
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 |
Output :
Example 2: Draw a line with only 1 axis coordinates as input:
Note: If you give only 1 axis then the plot() function takes it as coordinates of the y-axis and by default gives values to the x-axis starting from 1, 2, 3, up to y coordinates.
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 |
Output :
Example 3: Draw more than 1 line on the same graph with axis names:
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' ) |
Output :
Example 4: Now the value of the y-axis is given as matrix instead of vector:
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' ) |
Output:
Example 5: Now we plot the graph by using 2 y-axis one is on the left side another is on the right side.
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' ) |
Output:
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