Error using * ?
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hi. i wrote these codes. but it gives me error. plz help me. how can i fix this error?
![error.jpg](https://www.mathworks.com/matlabcentral/answers/uploaded_files/254464/error.jpeg)
if handles.plot2.Value==1
var1=get(handles.varible1,'string');
range1=str2num(get(handles.range1,'string'));
H=str2num(get(handles.hamiltonian,'string'));
if handles.thermal.Value==1
sx=[0 1;1 0];
sy=[0 -1i;1i 0];
sz=[1 0;0 -1];
s=kron(sy,sy);
ro = expm(-H/T)/trace(expm(-H/T));
la = real(sqrt(eig(ro*s*conj(ro)*s)));
co=@(var1) max(0,2*max(la)-sum(la));
var1=range1;
for k = 1:numel(range1)
cov(k) = co(range1(k));
end
axes(handles.axes1);
plot(range1, cov)
end
end
%the error is
%matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)quantum('temperature_CreateFcn',hObject,eventdata,guidata(hObject))
%Error using *
%Inner matrix dimensions must agree.
%Error in quantum>run_Callback (line 225)
% la = real(sqrt(eig(ro*s*conj(ro)*s)));
%Error in gui_mainfcn (line 95)
% feval(varargin{:});
%Error in quantum (line 42)
% gui_mainfcn(gui_State, varargin{:});
%Error in
%matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)quantum('run_Callback',hObject,eventdata,guidata(hObject))
%Error while evaluating UIControl Callback.
댓글 수: 2
Star Strider
2019년 12월 14일
The error is clear menough:
Error using *
Inner matrix dimensions must agree.
Error in quantum>run_Callback (line 225)
la = real(sqrt(eig(ro*s*conj(ro)*s)));
Examine the sizes of the components of that expression to see what the problem is.
Walter Roberson
2019년 12월 14일
Two many variables we do not know the size of.
Also, we have no reason to expect that the variable J will have a value at that point, so the str2num() is likely to return []
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