MATLAB：使用'fminsearch'函数时出错

Question

我正在做一项小型研究，需要找到某个函数的argmin。这是我写的函数。我想找到一个向量x，它给出这个函数的最小输出。我试过fminsearch(@crc,x)，但得到了以下结果错误

Error in fminsearch (line 200)
fv(:,1) = funfcn(x,varargin{:});

如有任何帮助或提示，我们将不胜感激。

function crc = SQ(x)
pdfx = gampdf([0:89],x(1),1/x(2));
pdfy =  gampdf([0:89],x(3),1/x(4));
pdfz = conv(pdfx,pdfy);
cdfz= cumsum(pdfz);
h=pdfz./(1-cdfz);
% I = piecewise(0<t<=9, 0.1, 9<t<=14, 0.3, 14<t<=19, 0.9, ...
% 19<t<=24, 1.5, 19<t<=29, 3,  29<t<=34, 5.7, 34<t<=39, 10.5, 39<t<=44, 19,...
% 44<t<=49, 33.1, 49<t<=54, 59.5, 54<t<=59, 68.4, 59<t<=64, 90.2, 64<t<=69,...
% 121.4, 69<t<=74, 153, 74<t<=79, 197.5, 79<t<=84, 237.9, 84<t<=89, 258.8);
I=zeros(1,161);
for t=0:1:89
if 0 < t && t <= 9
I(t)=.1;
elseif 9<t&& t <=14
I(t) = 0.3;
elseif 14<t && t<=19 
I(t) = 0.9;
elseif 19<t&& t <=24
I(t) = 1.5;
elseif 24<t&& t <=29
I(t) = 3;
elseif 29<t&& t <=34
I(t) = 5.7;
elseif 34<t&& t <=39
I(t) = 10.5;
elseif 39<t&& t <=44
I(t) = 19;
elseif 44<t&& t <=49
I(t) = 33.1;
elseif 49<t&& t <=54
I(t) = 59.5;
elseif 54<t&& t <=59
I(t) = 68.4;
elseif 59<t&& t <=64
I(t) = 90.2;
elseif 64<t&& t <=69
I(t) = 121.4; 
elseif 69<t&& t <=74
I(t) = 153;
elseif 74<t&& t <=79
I(t) = 197.5; 
elseif 79<t&& t <=84
I(t) = 237.9;
elseif 84<t&& t <=89
I(t) = 258.8;        

end
end
I=I/100000;
sqer = sum((h([20:89])-I([20:89])).^2);
end

Answer 1

您发布的错误消息看起来未完成。如果你给我们看完整的错误信息会更清楚
您的函数名为SQ；crc是其输出变量的名称
请注意，matlab通过函数的文件名来识别函数。我假设您的函数文件名为SQ.m
尝试

fminsearch(@SQ,x)