matlab拟合出错：Function value and YDATA sizes are not equal.x=1:1:5;y=[1976882 2972166 3752790 4077716 4154964]';function y=fitline_1(a,x)y=a(1)+a(2)x+a(3)x.^2+a(4)*x.^3;a=lsqcurvefit('fitline_1',[1;1;1;1],x,y);请问哪里出现了问题?

来源：学生作业帮助网编辑：作业帮时间：2024/05/08 14:11:31

matlab拟合出错：Function value and YDATA sizes are not equal.x=1:1:5;y=[1976882 2972166 3752790 4077716 4154964]';function y=fitline_1(a,x)y=a(1)+a(2)*x+a(3)*x.^2+a(4)*x.^3;a=lsqcurvefit('fitline_1',[1;1;1;1],x,y);请问哪里出现了问题?
matlab拟合出错：Function value and YDATA sizes are not equal.
x=1:1:5;
y=[1976882 2972166 3752790 4077716 4154964]';
function y=fitline_1(a,x)
y=a(1)+a(2)*x+a(3)*x.^2+a(4)*x.^3;
a=lsqcurvefit('fitline_1',[1;1;1;1],x,y);
请问哪里出现了问题?

把y赋值语句的转置符号去掉即可.

x是行向量,y应该也是行向量才对.

另外,使用多项式拟合完全可以用polyfit函数,比这个简单很多：

x=1:1:5;
y=[1976882 2972166 3752790 4077716 4154964];
a=polyfit(x,y,3);
plot(x,y,'ro',x,polyval(a,x),'.-')

matlab的lsqcurvefit函数做幂函数拟合出错幂函数拟合错误提示是ydata和函数输出维数不一样（Function value and YDATA sizes are incommensurate）,希望各位验证后再给出答案,function F=mihanshu(x,a)F=a(1)*(x.^a(2)); matlab拟合出错：Function value and YDATA sizes are not equal.x=1:1:5;y=[1976882 2972166 3752790 4077716 4154964]';function y=fitline_1(a,x)y=a(1)+a(2)*x+a(3)*x.^2+a(4)*x.^3;a=lsqcurvefit('fitline_1',[1;1;1;1],x,y);请问哪里出现了问题? Matlab 出错 matlab出错, This statement is not inside any function.matlab 运行,出错,这是怎么回事 matlab 使用lsqcurvefit函数出错需要拟合的函数m文件：function f = nihehanshu(a,t)f = (a(1)/a(2))^a(1)*t^(a(1)-1)*exp(-t*a(1)/a(2))/gamma(a(1));程序：t = [1,1.26,1.58,2,2.51,3.16,3.98,5.01,6.31,7.94,10,12.59,15.85,19.95,25.12,31.62]; matlab拟合函数 matlab的函数拟合 matlab中梯度函数gradient运行出错,显示这样的错误信息.Attempt to execute SCRIPT gradient as a function. matlab 求和的出错 matlab创建function出错,代码：function basePS=functionbasePS(n)%UNTITLED2 Summary of this function goes here% Detailed explanation goes heresyms tbasePS=zeros(1,n+1);for i=0:1:nif 0 MATLAB怎样搞多项式拟合如何运用MATLAB拟合二次曲线 matlab 怎样实现拉格朗日插值拟合? 怎样用matlab作线性拟合 matlab二元拟合程序是什么 matlab做的曲面拟合 sars的matlab拟合代码