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

2016 1 3
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更新时间：2016 1 6
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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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Image Analyst
Image Analyst 2016-1-3
编辑：Image Analyst 2016-1-3

0 个投票

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
Image Analyst 2016-1-3
Put this inside calcbutton_Callback(), not inside plotbutton_Callback(), though it doesn't hurt to have it there in case you ever change or add to handles inside that functions.
Image Analyst
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.

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更多回答（1 个）

Anisio Gomes
Anisio Gomes 2016-1-3

0 个投票

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..... :(

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Walter Roberson
Walter Roberson 2016-1-4
After the assignment to handles.ans2 you need to add
guidata(hObject, handles);
... like we said earlier.
Image Analyst
Image Analyst 2016-1-4
Let us know if it's fixed now.

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