hi guys, i want to plot in GUI, i've tried this code.

Question

Anisio Gomes 2016-1-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262468-hi-guys-i-want-to-plot-in-gui-i-ve-tried-this-code

评论： Anisio Gomes 2016-1-6

function calcbutton_Callback(hObject, eventdata, handles)
      dis = sqrt((handles.mydata.b)^2 -4*(handles.mydata.a)*(handles.mydata.c));
      ans1 = (-(handles.mydata.b) + dis) /(2*(handles.mydata.a));
      ans2 = (-(handles.mydata.b) - dis) /(2*(handles.mydata.a))
      set(handles.ans1, 'String', ans2);
      set(handles.ans2, 'String', ans1);
function plotbutton_Callback(hObject, eventdata, handles)
      x=0:10;
      plot(x,handles.ans1, handles.axes1);
      hold on;
      plot(x,handles.ans2, handles.axes2);

But it displays:

Error using plot
Data must be a single matrix Y or a list of pairs X,Y.

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Answer 1

Image Analyst 2016-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/262468-hi-guys-i-want-to-plot-in-gui-i-ve-tried-this-code#answer_204900

编辑：Image Analyst 2016-1-3

在 MATLAB Online 中打开

Get rid of the calls to set and just do this:

handles.ans1 = (-(handles.mydata.b) + dis) /(2*(handles.mydata.a));
handles.ans2 = (-(handles.mydata.b) - dis) /(2*(handles.mydata.a))

In the second callback do this instead:

x=0:(length(handles.ans1) - 1);
plot(x,handles.ans1, handles.axes1);
grid on;
hold on;
x=0:(length(handles.ans2) - 1);
plot(x,handles.ans2, handles.axes2);

If it still doesn't work, then find a call to guidata() somewhere in your code and copy it to the last line of the callback that assigns handles.ans1 and handles.ans2.

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Image Analyst 2016-1-3

There's something you're not showing us. Attach the .m file and the .fig file, and any data files it reads in.

Anisio Gomes 2016-1-3

编辑：Anisio Gomes 2016-1-3

I attached the m,fig,jpg files

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Answer 2

Anisio Gomes 2016-1-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262468-hi-guys-i-want-to-plot-in-gui-i-ve-tried-this-code#answer_204945

在 MATLAB Online 中打开

Thanks Image Analyst... I've tried

function calcbutton_Callback(hObject, eventdata, handles)
   dis = sqrt((handles.mydata.b)^2 -4*(handles.mydata.a)*(handles.mydata.c));
     handles.ans1 = (-(handles.mydata.b) + dis) /(2*(handles.mydata.a));
     handles.ans2 = (-(handles.mydata.b) - dis) /(2*(handles.mydata.a))
function plotbutton_Callback(hObject, eventdata, handles)
x=0:(length(handles.ans1) - 1);
plot(x,handles.ans1, handles.axes1);
grid on;
hold on;
x=0:(length(handles.ans2) - 1);
plot(x,handles.ans2, handles.axes2);
guidata(hObject, handles)
However, the error keep showing up..... :(