请问我这个matlab如何求由点以及拟合成的曲线以及真实曲线的误差之和哪里错了哈x1=0:1:10;y1=3*x1.^2+2*x1+6;z=0:0.001:10;y=spline(x1,y1,z);plot(x1,y1,z,y,'MarkerSize',12);sum=0;for ii=0:9x11=ii+0.5;r=(ii+1):(ii+2);a1=polyf
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![请问我这个matlab如何求由点以及拟合成的曲线以及真实曲线的误差之和哪里错了哈x1=0:1:10;y1=3*x1.^2+2*x1+6;z=0:0.001:10;y=spline(x1,y1,z);plot(x1,y1,z,y,'MarkerSize',12);sum=0;for ii=0:9x11=ii+0.5;r=(ii+1):(ii+2);a1=polyf](/uploads/image/z/7256571-51-1.jpg?t=%E8%AF%B7%E9%97%AE%E6%88%91%E8%BF%99%E4%B8%AAmatlab%E5%A6%82%E4%BD%95%E6%B1%82%E7%94%B1%E7%82%B9%E4%BB%A5%E5%8F%8A%E6%8B%9F%E5%90%88%E6%88%90%E7%9A%84%E6%9B%B2%E7%BA%BF%E4%BB%A5%E5%8F%8A%E7%9C%9F%E5%AE%9E%E6%9B%B2%E7%BA%BF%E7%9A%84%E8%AF%AF%E5%B7%AE%E4%B9%8B%E5%92%8C%E5%93%AA%E9%87%8C%E9%94%99%E4%BA%86%E5%93%88x1%3D0%3A1%3A10%3By1%3D3%2Ax1.%5E2%2B2%2Ax1%2B6%3Bz%3D0%3A0.001%3A10%3By%3Dspline%28x1%2Cy1%2Cz%29%3Bplot%28x1%2Cy1%2Cz%2Cy%2C%27MarkerSize%27%2C12%29%3Bsum%3D0%3Bfor+ii%3D0%3A9x11%3Dii%2B0.5%3Br%3D%28ii%2B1%29%3A%28ii%2B2%29%3Ba1%3Dpolyf)
请问我这个matlab如何求由点以及拟合成的曲线以及真实曲线的误差之和哪里错了哈x1=0:1:10;y1=3*x1.^2+2*x1+6;z=0:0.001:10;y=spline(x1,y1,z);plot(x1,y1,z,y,'MarkerSize',12);sum=0;for ii=0:9x11=ii+0.5;r=(ii+1):(ii+2);a1=polyf
请问我这个matlab如何求由点以及拟合成的曲线以及真实曲线的误差之和哪里错了哈
x1=0:1:10;
y1=3*x1.^2+2*x1+6;
z=0:0.001:10;
y=spline(x1,y1,z);
plot(x1,y1,z,y,'MarkerSize',12);
sum=0;
for ii=0:9
x11=ii+0.5;
r=(ii+1):(ii+2);
a1=polyfit(x1(r),y1(r),1);
f1=polyval(a1,x11);
freal=3*x11^2+2*x11+6;
sum=sum+(f1-freal);
end
N=length(x1)-1;
RMES=sqrt((sum^2)/(N-1));
结果好像很离谱的样子·····
请问我这个matlab如何求由点以及拟合成的曲线以及真实曲线的误差之和哪里错了哈x1=0:1:10;y1=3*x1.^2+2*x1+6;z=0:0.001:10;y=spline(x1,y1,z);plot(x1,y1,z,y,'MarkerSize',12);sum=0;for ii=0:9x11=ii+0.5;r=(ii+1):(ii+2);a1=polyf
应该这两句有问题,sum=sum+(f1-freal),RMES=sqrt((sum^2)/(N-1));;可以改成sum=sum+(f1-freal)^2,RMES=sqrt((sum)/(N-2));
运行结果为
RMES = 0.8385