作业帮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?
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![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?](/uploads/image/z/14054835-3-5.jpg?t=matlab%E6%8B%9F%E5%90%88%E5%87%BA%E9%94%99%EF%BC%9AFunction+value+and+YDATA+sizes+are+not+equal.x%3D1%3A1%3A5%3By%3D%5B1976882+2972166+3752790+4077716+4154964%5D%27%3Bfunction+y%3Dfitline_1%28a%2Cx%29y%3Da%281%29%2Ba%282%29%2Ax%2Ba%283%29%2Ax.%5E2%2Ba%284%29%2Ax.%5E3%3Ba%3Dlsqcurvefit%28%27fitline_1%27%2C%5B1%3B1%3B1%3B1%5D%2Cx%2Cy%29%3B%E8%AF%B7%E9%97%AE%E5%93%AA%E9%87%8C%E5%87%BA%E7%8E%B0%E4%BA%86%E9%97%AE%E9%A2%98%3F)
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y=[1976882 2972166 3752790 4077716 4154964];
a=polyfit(x,y,3);
plot(x,y,'ro',x,polyval(a,x),'.-')
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?
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?
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