lsqnonlin function error confusion

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Robert Smith 2017-9-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/357578-lsqnonlin-function-error-confusion

评论： Robert Smith 2017-9-20

Hi, I was running this code and it was working well but when I made small modifications it stopped working. Any help or clarification is appreciated! See code and error below:

function [R] = optimize_radius (raw_EM_cath)
numcath = size(raw_EM_cath,2);
for i = 1:numcath 
    raw_EM_cath(i).cath = raw_EM_cath(i).cath(8:end,:);
    center = lsqnonlin(@(point)distance(point, raw_EM_cath(i).cath), [median(raw_EM_cath(i).cath(:,1)), median(raw_EM_cath(i).cath(:,2)), median(raw_EM_cath(i).cath(:,3))]);
    d = pdist2(center, raw_EM_cath(i).cath);
    R(i, :) = [ mean(d), std(d), median(d), mode(d) ];
end
end

ERROR:

Output argument "d" (and maybe others) not assigned during call to
"optimize_radius>distance".
Error in optimize_radius>@(point)distance(point,raw_EM_cath(i).cath) (line 12)
    center = lsqnonlin(@(point)distance(point, raw_EM_cath(i).cath),
    [median(raw_EM_cath(i).cath(:,1)), median(raw_EM_cath(i).cath(:,2)),
    median(raw_EM_cath(i).cath(:,3))]);
Error in lsqnonlin (line 196)
            initVals.F = feval(funfcn{3},xCurrent,varargin{:});
Error in optimize_radius (line 12)
    center = lsqnonlin(@(point)distance(point, raw_EM_cath(i).cath),
    [median(raw_EM_cath(i).cath(:,1)), median(raw_EM_cath(i).cath(:,2)),
    median(raw_EM_cath(i).cath(:,3))]);
Caused by:
    Failure in initial objective function evaluation. LSQNONLIN cannot continue.