1. Discrete function
The discrete sequence on the graph only reflects the functional relationship in certain effective intervals, and cannot express the functional relationship in infinite intervals.
eg: graphical representation of discrete functions
%MATLAB可视化
%1---离散函数可视化，y=|(n-6)|^-1
clc
clear
n=0:15;
y=1./abs(n-6);
plot(n,y,'m*','MarkerSize',10)
grid on
2. Continuous function visualization
Like discrete function visualization, continuous function visualization must first calculate the corresponding function value on a set of discrete independent variables, and represent this set of data pairs with points.
(1) Separate the interval finely and use more points to express the continuity of the function;
(2) Connect the two points with a straight line.
eg：
%连续函数可视化
t1=(0:11)/11*pi; %自变量
y1=sin(t1).*sin(9*t1); %对应的函数值
t2=(0:100)/100*pi;
y2=sin(t2).*sin(9*t2);
%接下来绘图并将子图放于一起
subplot(2,2,1),plot(t1,y1,'r.'),axis([0,pi,-1,1]),title('子图（1）')
subplot(2,2,2),plot(t2,y2,'b.'),axis([0,pi,-1,1]),title('子图（2）')
subplot(2,2,3),plot(t1,y1,t1,y1,'r.'),axis([0,pi,-1,1]),title('子图（3）')
subplot(2,2,4),plot(t2,y2),axis([0,pi,-1,1]),title('子图（4）')