Variable / which matlab does not forget ?

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Max Müller
Max Müller 2014-7-29
评论： Joseph Cheng 2014-7-29
Hey Guys,
function testbutton_Callback(hObject, eventdata, handles)
x = get(handles.edit1,'String')
if ~exist('x','var')
x = []
end
y = [y,x]
This code is supposed to read the edit box and create an array which contains the Data. The array is supposed to expand every time u click the button. However, if the procedure is finished, matlab forgets/kills the x-value. now i want to know, how can i make matlab remember the X-Value after the procedure is done?

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采纳的回答

Joseph Cheng
Joseph Cheng 2014-7-29
You could use the userdata and store the values within the edit 1 box data field
userdata = get(handles.edit1,'userdata');
edit1stuff = get(handles.edit1,'String');
set(handles.edit1,'userdata',[userdata;edit1stuff])
since at the starts unless otherwise declared the userdata is empty for the field.
  1 个评论
Joseph Cheng
Joseph Cheng 2014-7-29
doing a very quick search i was able to find this link that shows the difference between the get and getappdata and the set and setappdata
http://www.mathworks.com/matlabcentral/answers/102591-what-is-the-difference-between-application-data-guidata-and-userdata-in-matlab
from skimming the post the difference is between meaningful to you and meaningful to matlab. in my example i use userdata but if you use the setappdata you can put anything you want without having to muddy the waters with the extra matlab declared stuff.

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更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-7-29
Nothing is forgotten, you can the value of x at any time
x = get(handles.edit1,'String')
  1 个评论
Max Müller
Max Müller 2014-7-29
编辑：Max Müller 2014-7-29
function AddAnotherShotButton_Callback(hObject, eventdata, handles)
shotnumber = str2num(get(handles.ShotEditbox,'String'));
UsedAmp = get(handles.UsedAmpRadioButton,'Value');
ClosestAmp = get(handles.ClosestAmpRadioButton,'Value');
OptimalAmp = get(handles.OptimalAmpRadioButton,'Value');
if ~exist('InputData','var')
InputData = [];
end
InputDataAppend = [shotnumber;UsedAmp;ClosestAmp;OptimalAmp]
InputData = [InputData,InputDataAppend]
set(handles.ShotEditbox,'String','');
set(handles.UsedAmpRadioButton,'Value',0);
set(handles.ClosestAmpRadioButton,'Value',0);
set(handles.OptimalAmpRadioButton,'Value',0);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
I want to:
get all the InputData
store it in an array
clear all InputObjects
get next InputData
store it .....

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Julia
Julia 2014-7-29
Hi,
try this:
Declare an array/variable y in the opening function
handles.y=0;
and update y every time you write a new value in it:
y=[y,x];
guidata(hObject, handles); % updates handles structure
  1 个评论
Max Müller
Max Müller 2014-7-29
Thats one way i guess....my mentor told me to use getappdata/setappdata. The syntax is setappdata(h,name,val), but i miss an example.

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