Variable / which matlab does not forget ?

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?

Answer 1

[Joseph Cheng]

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.

[Joseph Cheng]

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.

Answer 2

[Azzi Abdelmalek]

Nothing is forgotten, you can the value of x at any time

x = get(handles.edit1,'String')

[Max Müller]

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 .....

Answer 3

[Julia]

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

[Max Müller]

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.