polyfit.m在MATLAB安装目录下\toolbox\matlab\polyfun function [p,S,mu] = polyfit(x,y,n) %POLYFIT Fit polynomial to data. % P = POLYFIT(X,Y,N) finds the coefficients of a polynomial P(X) of % degree N that fits the data Y best in a least-squares sense. P is a % row vector ...
7、ling. class support for inputs x,y: float: double, singlepolyfit.m 在matlab安装目录下 toolboxmatlabpolyfunfunction p,s,mu = polyfit(x,y,n)%polyfit fit polynomial to data.% p = polyfit(x,y,n) finds the coefficients of a polynomial p(x) of% degree n that fits the data y best...
若提示 MATLAB:polyfit:RepeatedPoints,考虑添加更多的不同的拟合点 若提示 MATLAB:polyfit:RepeatedPointsOrRescale,考虑1、添加更多的不同的拟合点;2、减少多项式的次数 源码阅读 function [p,S,mu] = polyfit(x,y,n) %POLYFIT Fit polynomial to data. % P = POLYFIT(X,Y,N) finds the coefficients of ...
1 Matlab 曲线拟合之polyfit与polyval函数 p=polyfit(x,y,n) [p,s]= polyfit(x,y,n) 说明:x,y为数据点,n为多项式阶数,返回p为幂次从高到低的多项式系数向量p。x必须是单调的。矩阵s用于生成预测值的误差估计。 多项式曲线求值函数:polyval( ) 调用格式: y=polyval(p,x) [y,DELTA]=polyval(p,x,s...
This MATLAB function returns the coefficients for a polynomial p(x) of degree n that is a best fit (in a least-squares sense) for the data in y.
error('MATLAB:polyfit:XYSizeMismatch',... 'XandYvectorsmustbethesamesize.') end x=x(:); y=y(:); ifnargout>2 mu=[mean(x);std(x)]; x=(x-mu(1))/mu(2); end %ConstructVandermondematrix. V(:,n+1)=ones(length(x),1,class(x)); ...
>> x=[2138 2150 2177 2204 2241]y=[825 834 853 873 900]x = 2138 2150 2177 2204 2241 y = 825 834 853 873 900 >> p1=polyfit(x,y,1)p1 = 0.7271 -729.4239 --- 你的语句没有问题。检查一下你是不是自己编了一个polyfit.m的脚本文件，删掉它。或者改个名字。open polyfit试...
MATLAB Online에서 열기 I have the following data: 테마복사 displacement = [0,1,2,3,4,5,6,7,8,9,10] TensileStress = [0,10,14,16,18,19,20,21,22,23,23] I am trying to find the function that best fits the data, but going through the steps, I am battling ...
fun为待拟合函数计算x处拟合函数值其定义为functionfmyfunxxdata polyfit与polyval的使用 po lyfit与polyval的使用 ployfit是matlab中基于最小二乘法的多项式拟合函数。最基础的用法如下:C=polyfit(X,Y,N) 其中: X : 需要拟合的点的横坐标 Y:需要拟合的点的纵坐标 N:以N阶多项式进行拟合 C:返回的N+1个拟合...
function y=hermite(X,Y,y1,x) n=length(X); m=length(x); for i=1:m y0=0; for j=1:n h=1; a=0; for k=1:n if k~=j h=h*((x(i)-X(k))/(X(j)-X(k)))^2; a=1/(X(j)-X(k))+a; end end y0=y0+h*(((X(j)-x(i))*(2*a*Y(j)-y1(j))+Y(j))); en...