Progress of calculation

Hi, if I press pushbutton, then I calculate matrix "result" like

matrix =[A B C D; E F G H, I J K L];
result=(simple(matrix\Z));.

Is possible to show progress of this calculation? Progress begin, if I press the button and stop if calculation is stop. I found this code, but it's not what I realy need because bar is independent on the calculation.

        h = waitbar(0,'Please wait...');
    steps = 1000;
    for step = 1:steps
        % computations take place here
        waitbar(step / steps)
    end
    close(h)

Time of calculation is not the same, it is variable.

Answer 1

[Walter Roberson]

If you do not have any information about how long the calculation "should" take, and you do not have access to the source to put in hooks to update progress information based upon internal knowledge of how far the algorithm has gotten, then NO, you cannot create any kind of progress bar.

You can create visual feedback that the computation is not yet finished (a "spinner" or "hourglass"), but without one of the two pieces of information I mention above, you cannot know how far it has gotten or whether it will finish at all.

[john]

Hi,

I don't have above two informations. I have only matrix =[A B C D; E F G H, I J K L];

result=(simple(matrix\Z));......I don't know how long the calculation "should" take. And how can I use a "spinner" or "hourglass"?

[Walter Roberson]

http://www.mathworks.com/help/techdoc/creating_plots/f5-35149.html

[john]

If I press button, I want to set text on the begin of the program as you can see. Than follow calculation. On the finish I want to set text "calculating done"

{function pushbutton_Callback(hObject, eventdata, handles)

set(handles.text5,'string','calculating start')

.

.

matrix =[A B C D; E F G H, I J K L];

result=(simple(matrix\Z));

.

.

set(handles.text5,'string','calculating done')}

But I never see calculating start...It seem like bushbutton makes all sets on the end of the function. But how can I do, what I need?

[Walter Roberson]

After the set(), call drawnow()