GUI register?

Hi,

I'm wandering how come the below code from GUI doesnt create registers that are stored in workplace? What should i do if i wana create the register in workplace via GUI?

function im1_ButtonDownFcn(hObject, eventdata, handles)
  % hObject    handle to im1 (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
  global a;
  [FileName,PathName]= uigetfile(...
      {'*.bmp;*.jpg;*.jpeg;*.tif;*.tiff;*.png','All Image Files(*.bmp,*.jpg,*.jpeg,*.tif,*.tiff,*.png)';...
      '*bmp','bitmap Files (*.bmp)';...
      '*.jpg;*.jpeg','JPEG Files(*.jpg,*.jpeg)';...
      '*.tif;*.tiff','Tiff Files(*.tif,*.tiff)';...
      '*png','PNG Files (*.png)';...
      '*.*','All Files (*.*)'}, ...
      'Pick an image file');

    fullpath = sprintf('%s%s',PathName, FileName);
    a=imread(fullpath);
    imshow(fullpath,'parent',handles.im1);

[Paulo Silva]

can you please explain what are you talking about? what is the register?

[Image Analyst]

Maybe he means variable??? But he declared "a" global, so I'm not sure what he's talking about either. By the way, you already read in the image. So I'd do it this way instead:

axes(handles.im1);

imshow(a);

[Kyle]

ya i'm talking about variable. i notice that the variable a is not in my workspace after executing the code.

a=imread(fullpath);

This line was added later on, as i want to store the image in variable a so that other function could use it. now the only way i could pass the variable is by making it 'global' on every function that need to use variable a.

[Image Analyst]

Yes, that is true. It is more like a "friend" or shared variable than a true global. It's not really global, only routines that have the line "global a;" will be able to see it. It's saved in the global workspace of your m-file so you won't see it in the "base" workspace which is always there, even when your code finishes. If you need it in the base workspace (for some reason that I can't figure out) then you need to call assignin, as the others said.

Answer 1

[Prabhakar]

If the question means that you want to create a variable in the base workspace filled with data from the GUI. Then in a callback for a button, use the ASSIGNIN function with an argument for assignment into the 'base' workspace to create variables in the base workspace with data from the GUI.

Refer to the documentation for ASSIGNIN at the following link: http://www.mathworks.com/help/matlab/ref/assignin.html

Answer 2

[Paulo Silva]

Like Prabhakar said use assignin

a=imread(fullpath);
assignin('base','a',a);

[Kyle]

Thanks.