How to deal with gui's and handles in .m

Basically from a gui i run with a function a .m file that contains a for cycle. Let's suppose that this cycle has 2 iterations. At the end of the first iteration i'd like to display in the gui the percentual of the routine, therefore have an output in the gui.

This is the part of the code that i have at the end of the for cycle in the .m file of the function

    compl=(index/num_repetitions)*100;
    assignin('base','compl',compl)
    compl = evalin('base', 'compl');
    handles=guidata(handles.percentual);
    set(handles.percentual,'String',compl);

While this is the error i obtain

??? Undefined function or variable "handles".

Error in ==> sim_main_part2 at 138 handles=guidata(handles.percentual);

Error in ==> GUI>simulate_Callback at 237 [y]=sim_main_part2(ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions);

What should i do to make it work? Thank you for any help

Answer 1

[Doug Hull]

Video dealing with these issues.

This line of code does not make much sense

handles=guidata(handles.percentual);

It is unclear what it should be out of context, but watch the video and you should be fine.

[Michele]

i am sorry but it did not help. it always says

??? Undefined function or variable "handles".

Error in ==> sim_main_part2 at 138 set(handles.percentual,'String',num2str(compl));

Error in ==> GUI>simulate_Callback at 237 [handles, y]=sim_main_part2(ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions);

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> GUI at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)GUI('simulate_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

and thank you for the help!

Answer 2

[Image Analyst]

You called sim_main_part2() but didn't pass in handles. Since it's not a GUIDE-generated callback, it does not automatically have handles in the private, local workspace of the sim_main_part2() function. If you want to use handles in that function, you will have to pass it in, and list it as an argument in the function declaration line:

function y = sim_main_part2(handles, ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions)
% Code goes here...

If you change handles, you can pass it out also:

function [handles, y] = sim_main_part2(handles, ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions)
% Code goes here...

[Michele]

i tried but it does not work in this way. Should i change something else in the code? thank you!

[Image Analyst]

It does work but you must have done something wrong. If your code is in the comment to Doug, the wrong part is that when you called sim_main_part2(), you did not pass in handles. You need to declare it like I said then call it passing in handles (also like I said):

[handles, y] = sim_main_part2(handles, ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions);

The above is how you CALL it, not how you declare it which I already told you how to do in my first reply.

[Image Analyst]

It does work but you must have done something wrong. If your code is in the comment to Doug, the wrong part is that when you called sim_main_part2(), you did not pass in handles. You need to declare it like I said then call it passing in handles (also like I said):

[handles, y] = sim_main_part2(handles, ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions);

The above is how you CALL it, not how you declare it which I already told you how to do in my first reply.

[Michele]

indeed i did not write it correctly! Anyhow now i don't have an error but i don't see the refresh of the data while the for cycle is still running. and even at the end of the cycle the value is still not uploaded.

[Image Analyst]

Sometimes if number crunching is happening too rapidly it won't update guis. In that case put a drawnow call right after you want the gui to update/refresh/repaint and it will force it to be current.

[Michele]

that is the code i have not in the .m of the gui but in the .m of the function i call

function [handles, y]=sim_main_part2(handles, ll, dz, stDdz, z, teta, Const_x, Const_y, PixScale, num_repetitions);
...
for i=1:10
    ...
    assignin('base','compl',compl)
    compl = evalin('base', 'compl');
    set(handles.percentual,'String',num2str(compl));
    drawnow
 end

buy the edit text (handles.percentual) is not updated and remains as setted at the beginning at 0. What should i do? Also write something in the callback of the edit text in the .m of the gui? Still thank you for following me in that problem. i do appreciate.

[Image Analyst]

What is the point of

assignin('base','compl',compl)
compl = evalin('base', 'compl');

?? It is not needed at all.

[Michele]

I thought it was necessary, my fault. Thank you! Anyhow the problem remains.

[Image Analyst]

What data are you trying to refresh? handles.percentual? Is it an edit text or a static text? Are you sure compl is changing each time? Does it update if you step through it a line at a time in the debugger?

[Michele]

It is an edit text (with 'tag'=percentual) and i want to write there value 'compl' that changes every cycle. it does change during the cycles. and it updates. the problem seems that it does not write the value in the text in the gui! I'd like to remark that in the .m file of the gui i call the function. In this function i have a for cycle and at the end of every iteration i would like to have this variable displaced in the edit text.

[Image Analyst]

Then the code should work. I don't know what else to do unless you upload your files.

[Michele]

it does not unfortunately

[Image Analyst]

Well I guess you're totally and completely out of luck, since it looks like you've stopped trying to solve it, or else you chose not to upload your files for some other reason (such as they're secret/proprietary).

[Michele]

actually i expected to solve it sooner, then other tasks rised. can you please give me an email address where to send the files? Then of course i will write here the solution to the problem.

[Image Analyst]

You can attach files here. I don't take files via email. But I give no guarantee that I'll have time to look at them.