matlab 最小二乘法拟合直线,横坐标是x=0.01:0.01:1;m=log(x);纵坐标是for i=1:100;y(i)=log((2^0.5)*(x(i)+1)/(x(i)*x(i)+2*x(i))^0.5);end求拟合,m,y并求拟合出来的直线斜率.速速速!
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![matlab 最小二乘法拟合直线,横坐标是x=0.01:0.01:1;m=log(x);纵坐标是for i=1:100;y(i)=log((2^0.5)*(x(i)+1)/(x(i)*x(i)+2*x(i))^0.5);end求拟合,m,y并求拟合出来的直线斜率.速速速!](/uploads/image/z/7102258-34-8.jpg?t=matlab+%E6%9C%80%E5%B0%8F%E4%BA%8C%E4%B9%98%E6%B3%95%E6%8B%9F%E5%90%88%E7%9B%B4%E7%BA%BF%2C%E6%A8%AA%E5%9D%90%E6%A0%87%E6%98%AFx%3D0.01%3A0.01%3A1%3Bm%3Dlog%28x%29%3B%E7%BA%B5%E5%9D%90%E6%A0%87%E6%98%AFfor+i%3D1%3A100%3By%28i%29%3Dlog%28%282%5E0.5%29%2A%28x%28i%29%2B1%29%2F%28x%28i%29%2Ax%28i%29%2B2%2Ax%28i%29%29%5E0.5%29%3Bend%E6%B1%82%E6%8B%9F%E5%90%88%2Cm%2Cy%E5%B9%B6%E6%B1%82%E6%8B%9F%E5%90%88%E5%87%BA%E6%9D%A5%E7%9A%84%E7%9B%B4%E7%BA%BF%E6%96%9C%E7%8E%87.%E9%80%9F%E9%80%9F%E9%80%9F%21)
matlab 最小二乘法拟合直线,横坐标是x=0.01:0.01:1;m=log(x);纵坐标是for i=1:100;y(i)=log((2^0.5)*(x(i)+1)/(x(i)*x(i)+2*x(i))^0.5);end求拟合,m,y并求拟合出来的直线斜率.速速速!
matlab 最小二乘法拟合直线,
横坐标是x=0.01:0.01:1;
m=log(x);
纵坐标是
for i=1:100;
y(i)=log((2^0.5)*(x(i)+1)/(x(i)*x(i)+2*x(i))^0.5);
end
求拟合,m,y
并求拟合出来的直线斜率.速速速!
matlab 最小二乘法拟合直线,横坐标是x=0.01:0.01:1;m=log(x);纵坐标是for i=1:100;y(i)=log((2^0.5)*(x(i)+1)/(x(i)*x(i)+2*x(i))^0.5);end求拟合,m,y并求拟合出来的直线斜率.速速速!
首先确认一下,你这的log是以10为底的对数吧?那么命令如下.(如果是以e为底就不用除以log(10)了,自己改一下.)
>> x=0.01:0.01:1;
>> m=log(x)/log(10);
>>for i=1:100;
y(i)=log((2^0.5)*(x(i)+1)/(x(i)*x(i)+2*x(i))^0.5)/log(10);
end
>>plot(m,y,'r');hold on;
>>p = polyfit(m,y,1)%这个就是拟合的函数
p =
-0.3600 0.4161
>>pp=poly2sym(p);
>>ezplot(pp,[-2,0]);
红色的是原曲线,蓝色的是拟合直线.拟合直线的斜率就是-0.3600