传感器作业1-6

            x=[0,0.5,1.0,1.5,2.0,2.5];
          
            y1f=[0.0020,0.2015,0.4005,0.6000,0.7995,1.0000];
          
            y1b=[0.0030,0.2020,0.4020,0.6010,0.8005,1.0000];
          
            y2f=[0.0025,0.2020,0.4010,0.6000,0.7995,0.9995];
          
            y2b=[0.0035,0.2030,0.4020,0.6015,0.8005,0.9995];
          
            y3f=[0.0035,0.2020,0.4010,0.6000,0.7995,0.9990];
          
            y3b=[0.0040,0.2030,0.4020,0.6010,0.8005,0.9990];

求出平均值：

y=mean([y1f;y1b;y2f;y2b;y3f;y3b]);

使用“端点直线法”

            k=(y(end)-y(1))/(x(end)-x(1));
          
            b=y(1)-k*x(1);
          
            y_1=k*x+b;

使用最小二乘法

            coefficient=polyfit(x,y,1) ;
          
            k=coefficient(1);b=coefficient(2);
          
            y_2=k*x+b;

数据

            name={'压力';'原始数据';'端点直线法';'最小二乘法'};
          
            data=table([x;y;y_1;y_2]);
          
            data.Properties.RowNames = name
          
                  data = 4×1 table
                  
                          Var1
                        
                          1 压力
                        
                          0
                        
                          0.5000
                        
                          1.0000
                        
                          1.5000
                        
                          2.0000
                        
                          2.5000
                        
                          2 原始数据
                        
                          0.0031
                        
                          0.2023
                        
                          0.4014
                        
                          0.6006
                        
                          0.8000
                        
                          0.9995
                        
                          3 端点直线法
                        
                          0.0031
                        
                          0.2024
                        
                          0.4016
                        
                          0.6009
                        
                          0.8002
                        
                          0.9995
                        
                          4 最小二乘法
                        
                          0.0030
                        
                          0.2022
                        
                          0.4015
                        
                          0.6008
                        
                          0.8000
                        
                          0.9993

	Var1
1 压力	0	0.5000	1.0000	1.5000	2.0000	2.5000
2 原始数据	0.0031	0.2023	0.4014	0.6006	0.8000	0.9995
3 端点直线法	0.0031	0.2024	0.4016	0.6009	0.8002	0.9995
4 最小二乘法	0.0030	0.2022	0.4015	0.6008	0.8000	0.9993

绘图

hold on

plot(x,y,'x')

plot(x,y_1)

plot(x,y_2);

legend("原始数据",strcat('端点直线法k=',num2str(k),';b=',num2str(b)),strcat('最小而乘法k=',num2str(k),';b=',num2str(b)))

hold off