Error using plot Vectors must be the same length
显示 更早的评论
x1 = [0,3,6,9,12,15,18,21,24,27,30,33,36,39,41,44,47,50,53,56,59,62]; y1 = [1.4750,1.0873,0.7613,0.5446,0.3883,0.2920,0.1983,0.1416,0.1000,0.0710,0.0527,0.0360,0.0253,0.0186,0.0136,0.0093,0.0060,0.0041,0.0030,0. 0020,0, 0016,0.0010];
x2 = [0,3,6,9,12,15,18,21,24,27,30,33,36,39,41,44,47,50,53,56,59,62]; y2 = [0.3887,0.0837,-0.2731,-0.6077,-0.9460,-1.2658,-1.6180,-1.9547,-2.3026,-2.6451,-2.9431,-3.3242,-3.6770,-3.9846,-4.2977,-4.6777,-5.1160,-5.7763,-5.8091,-6.2146,-6.4377,-6.9077]
n = length(x); sumx=0.0; sumy=0.0; sumxy=0.0; sumxx=0.0;
for i=1:n sumx=sumx+x(i); sumy=sumy+y(i); sumxy=sumxy+x(i)*y(i); sumxx=sumxx+x(i)*x(i); end
%Determine Slope and y-intercept slope=(n*sumxy-sumx*sumy)/(n*sumxx-sumx^2); y_int=(sumxx*sumy-sumxy*sumx)/(n*sumxx-sumx^2);
z=slope*x+y_int;
%Making a plot loaded data plot(x1,y1,'bo',x,z,'r-') hold on Plot(x2,y2,’bo’,x,z,’r-‘) Hold off xlabel("time(s)") ylabel("v(t) v") %print('RC.png','-dpng')
%Errors di=y-(slope*x+y_int);
Error_in_slope=sqrt(sum(di.*di)*(n/(n-2))/(n*sumxx-sumx^2)); Error_in_y_int=sqrt(sum(di.*di)*sumxx*(n/(n-2))/(n*sumxx-sumx^2));
2 个评论
Walter Roberson
2020-10-9
Please reformat your code. Go into the editor and select the code and press the ">" button.... and then go through it and put in the appropriate line breaks, as we cannot assume which parts are really commented out and which just look to be commented out due to bad formatting.
采纳的回答
KSSV
2020-10-9
for i=1:n
sumx=sumx+x(i);
sumy=sumy+y(i);
sumxy=sumxy+x(i)*y(i);
sumxx=sumxx+x(i)*x(i);
end
Toa chieve above you need not run a loop..you can achieve that using:
sumx = sum(x) ;
sumy = sum(y) ;
sumxy = sum(x.*y) ;
sumxx = sum(x.*x) ;
Note that to get sumxy, the dimensions of x and y should be same.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 MATLAB 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
