Trace variables of a function when executing

Question

SAM Arani 2022-9-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1802855-trace-variables-of-a-function-when-executing

评论： Walter Roberson 2022-9-11

I have a matlab UI and it is desired to update the progressbar of this UI based on a variable which is being used in a running code ina function.

Consider below example:

%% a UI Code:
                    currentProg = min(round((size(wbar,2)-2)*(i/n)),size(wbar,2)-2);
                    RGB = app.processDataButtonHandle.Icon;
                    RGB(2:end-1, 2:currentProg+1, 1) = 0.25391; % (royalblue)
                    RGB(2:end-1, 2:currentProg+1, 2) = 0.41016;
                    RGB(2:end-1, 2:currentProg+1, 3) = 0.87891;
                    app.processDataButtonHandle.Icon = RGB; % (royalblue)
                   

where

i

is a variable which shall be real time value of iterations in a for loop used in a function.

So, the whole code can be seen as:

%% a UI Code:
                    currentProg = min(round((size(wbar,2)-2)*(i/n)),size(wbar,2)-2);
                    RGB = app.processDataButtonHandle.Icon;
                    RGB(2:end-1, 2:currentProg+1, 1) = 0.25391; % (royalblue)
                    RGB(2:end-1, 2:currentProg+1, 2) = 0.41016;
                    RGB(2:end-1, 2:currentProg+1, 3) = 0.87891;
                    app.processDataButtonHandle.Icon = RGB; % (royalblue)
                    my_function(m,n,...)% other input variables
                    

where in my_function() we have:

    
function my_function(m,n,...)% other input variables
    for i=1:n
    %% do some thing based on m
    end
end

Do we have any possible way of updating that progress bar based on variable i which is in a for loop inside a function?

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Answer 1

Walter Roberson 2022-9-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1802855-trace-variables-of-a-function-when-executing#answer_1051105

No, not without the cooperation of the function being executed or using the debug facilities, or the cooperation of some function called by the target function

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SAM Arani 2022-9-11

can I have examples of introduced ways?

I'm not so sure about the ways you mentioned but the debug facilities.

What do you mean by cooperation of the funtion or the functions called by the target function?

Walter Roberson 2022-9-11

The function itself could call waitbar(). Or a function that it calls could call waitbar(). Or you could use "dbstop at LINE if CONDITION" where you have coded CONDITION to invoke something that calls waitbar()

Note: there is an enhanced function that works like waitbar in the File Exchange, that also shows an estimate of time to completion

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