求教用matlab 实现最小二乘法拟合曲线的问题数据如下:x=(1,2,3,4,5,6,7,8,9,10)y=( 96.31,135.44,79.5,56.54,256.21,350.68,105.62,185.03,493.08,1031.17,860.06,746.78)表达式为:Y = a x4+b x3+c x2+d x+e求:a,b,c,d,e,以及 可靠
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![求教用matlab 实现最小二乘法拟合曲线的问题数据如下:x=(1,2,3,4,5,6,7,8,9,10)y=( 96.31,135.44,79.5,56.54,256.21,350.68,105.62,185.03,493.08,1031.17,860.06,746.78)表达式为:Y = a x4+b x3+c x2+d x+e求:a,b,c,d,e,以及 可靠](/uploads/image/z/5165547-51-7.jpg?t=%E6%B1%82%E6%95%99%E7%94%A8matlab+%E5%AE%9E%E7%8E%B0%E6%9C%80%E5%B0%8F%E4%BA%8C%E4%B9%98%E6%B3%95%E6%8B%9F%E5%90%88%E6%9B%B2%E7%BA%BF%E7%9A%84%E9%97%AE%E9%A2%98%E6%95%B0%E6%8D%AE%E5%A6%82%E4%B8%8B%EF%BC%9Ax%3D%281%2C2%2C3%2C4%2C5%2C6%2C7%2C8%2C9%2C10%29y%3D%28+96.31%2C135.44%2C79.5%2C56.54%2C256.21%2C350.68%2C105.62%2C185.03%2C493.08%2C1031.17%2C860.06%2C746.78%29%E8%A1%A8%E8%BE%BE%E5%BC%8F%E4%B8%BA%EF%BC%9AY+%3D+a+x4%2Bb+x3%2Bc+x2%2Bd+x%2Be%E6%B1%82%EF%BC%9Aa%2Cb%2Cc%2Cd%2Ce%2C%E4%BB%A5%E5%8F%8A+%E5%8F%AF%E9%9D%A0)
求教用matlab 实现最小二乘法拟合曲线的问题数据如下:x=(1,2,3,4,5,6,7,8,9,10)y=( 96.31,135.44,79.5,56.54,256.21,350.68,105.62,185.03,493.08,1031.17,860.06,746.78)表达式为:Y = a x4+b x3+c x2+d x+e求:a,b,c,d,e,以及 可靠
求教用matlab 实现最小二乘法拟合曲线的问题
数据如下:x=(1,2,3,4,5,6,7,8,9,10)
y=( 96.31,135.44,79.5,56.54,256.21,350.68,105.62,185.03,493.08,1031.17,860.06,746.78)
表达式为:Y = a x4+b x3+c x2+d x+e
求:a,b,c,d,e,以及 可靠度 ,请高手赐教,怎么用matlab 实现,本人菜鸟,
但能不能详细说一下怎么确定拟合曲线的精确度?
另:修改x=(1,2,3,4,5,6,7,8,9,10,11,12) ,上面后两个数忘了加上了.
求教用matlab 实现最小二乘法拟合曲线的问题数据如下:x=(1,2,3,4,5,6,7,8,9,10)y=( 96.31,135.44,79.5,56.54,256.21,350.68,105.62,185.03,493.08,1031.17,860.06,746.78)表达式为:Y = a x4+b x3+c x2+d x+e求:a,b,c,d,e,以及 可靠
使用多项式拟合函数polyfit(x,y,n),其中x是你要你和的自变量,y是你要拟合的因变量,n是你要用到的拟合多项式的最高次数,函数返回这个多项式.
具体你的问题:
x=[1,2,3,4,5,6,7,8,9,10,11,12]
y=[ 96.31,135.44,79.5,56.54,256.21,350.68,105.62,185.03,493.08,1031.17,860.06,746.78]
z=polyfit(x,y,4)
ans =
-0.9026 22.3624 -171.6814 489.5975 -287.8153