Why log file is not updating at first time execution of script?

Hello,

I am creating log file after the execution some command but for first time only file is creating not containing any log:

   catch
        disp("Error using slbuild_private:Unable to check out the Simulink Coder license to generate code")

            diary('Error_log_file.txt');

In this case for the first time execution of script, is only creating 'Error_log_file.txt' and there is no log in it. But, when I am executing script second time and so on it's showing me log.

Is there any way to log command window data at 1st time of execution?

 Thanks,

[KALYAN ACHARJYA]

Can you share more detail & code?

Is the following error displayed?

disp("Error using slbuild_private: Unable to check out the Simulink Coder license to generate code")

Answer 1

[Walter Roberson]

Invoke diary() before the disp()

[Mady J]

i tried with this code:

if LicenseReturnVal==1
            load('file.mat')
            rtwbuild('model_name')
            %slbuild('model_name')
            close_system('model_name');
            diary('log_test.txt')
        else
           diary('log_test.txt') 
           disp("Error in log")
        end

And still it's not working.

[Stephen23]

"And still it's not working. "

How are you checking this? Did you use exist to check for that file?

[Walter Roberson]

You always end up calling diary(), so just do that first.

diary('log_test.txt')
if LicenseReturnVal==1
            load('file.mat')
            rtwbuild('model_name')
            %slbuild('model_name')
            close_system('model_name');
        else
           disp("Error in log")
        end

[Mady J]

Hello Walter Roberson,

Thank you for reply,As per my understanding i think diary command first create file, if not exist -> In first execution. And from second time of execution command maintain the log on existing file.

[Walter Roberson]

Yes, if the diary file already exists then diary() with the same file name will append to it. However, logging to the diary will start immediately after the first time diary is called for any given file name.