Error setting property 'String' of class 'UIControl' method lin bairstow

Question

Erwin Avendaño 2017-11-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/364679-error-setting-property-string-of-class-uicontrol-method-lin-bairstow

回答： Erwin Avendaño 2017-11-3

Hello! How are you. As you can see in the image, the matlab throws me an error in my script then I leave the code to tell me what's wrong with me, please I took a little time in Matlab and I really do not know how to solve this problem. i'm working in gui of matlab

% --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles)

a=zeros(1,7);

b=zeros(1,7);

c=zeros(1,7);

a(1,3)=str2double(get(handles.edit2,'string'));

a(1,4)=str2double(get(handles.edit3,'string'));

a(1,5)=str2double(get(handles.edit4,'string'));

a(1,6)=str2double(get(handles.edit5,'string'));

a(1,7)=str2double(get(handles.edit6,'string'));

r=str2double(get(handles.edit13,'string'));

s=str2double(get(handles.edit12,'string'));

ciclos=str2double(get(handles.edit11,'string'));

for k=1:1:ciclos

syms dr ds; for i=3:1:7 b(1,i)=a(1,i)+r*b(1,i-1)+s*b(1,i-2); end

    for j=3:1:7
    c(1,j)=b(1,j)+r*c(1,j-1)+s*c(1,j-2);
    end

E1=c(1,5)*dr+c(1,4)*ds==-b(1,6);

E2=c(1,6)*dr+c(1,5)*ds==-b(1,7);

[dr,ds]=(solve(E1,E2));

B=b;

C=c;

Deltas=[vpa(dr,4),vpa(ds,4)];

r=r+dr;

s=s+ds;

end

vpa(r,5);

vpa(s,5);

vpa(dr,4);

vpa(ds,4);

set(handles.edit7,'string',r);

set(handles.edit8,'string',s);

set(handles.edit9,'string',dr);

set(handles.edit10,'string',ds);

% --- Executes on button press in pushbutton2.

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Answer 1

Erwin Avendaño 2017-11-3

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I'll try it later, the way I solved it is that the system of equations solved it with matrices (gauss jordan) and did not use the solve command for the system of equations. Thank you for answered

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Answer 2

Steven Lord 2017-11-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/364679-error-setting-property-string-of-class-uicontrol-method-lin-bairstow#answer_289039

You can't set the String property of a UIControl to contain a symbolic expression directly. Either convert the symbolic expression to a numeric array using double (this will NOT work if the expression contains a symbolic variable) or convert it into a char vector using char and set the result as the value of the String property.

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Erwin Avendaño 2017-11-2

I'll try it later, the way I solved it is that the system of equations solved it with matrices (gauss jordan) and did not use the solve command for the system of equations. Thank you for answered

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