How to compile a Standalone App which requires Python?

I am trying to compile a Standalone App with App designer.

The goal should be that other user can open the App without having Matlab installed.

The App workes on App Designer perfectly. Even if I compile the App and open it on my computer everything runs.

However, if I open the App on an other computer (without MATLAB, Python and CoolProp) the App opens but the calculation can't be done.

I guess the problem is the missing Python and/or CoolProp on the second Computer.

My code uses this function:

rho=py.CoolProp.CoolProp.PropsSI('D','T',273.15+ T_gc_out ,'P',p_h,KM)

Is there a way to compile the App including the required Python and CoolProp software to run my programm? I want to include these files, or codes in the app such that the other users don't have to download Python and CoolProp separately.

[Mario Malic]

I think you could rather use websave to download Python directly to app root directory from this link, take a look at embeddable package, it's an archive file that you could unpack through MATLAB and use pyenv with input arguments to specify the location of the Python executable. Maybe you could do similarly for CoolProp, I don't know what is it.

Answer 1

[Rashed Mohammed]

Hi Giancarlo

As of R2021a, MATLAB doesn't support including external software when deploying an application automatically. However, as Mario suggested, you can try including the embeddable package of python. Note that it does not contain pip to install other packages. Hence, you also need to use the manual local installation instructions present in the CoolProp documentation.

Hope this helps

[Jan]

I want to do the same thing i.e. compile a Standalone App with App designer which uses some python functions.

Do I understand correctly that I need to ensure that the embeddable version of python is installed with the correct packages? Does that still work or does matlab does not support this anymore?

I haven't build the App but I'm considering App designer and I don't want to do the effort and afterwards realise it can't be done.

[Giancarlo Meccariello]

I do not know if this still works. I am not using Matlab anymore. If you anyways are going to use Python functions, then it is maybe easier to create the UI with Python (Tkinter?) and not using the Matlab app builder.

Answer 2

[Giancarlo Meccariello]

I found a way to do so.

I added an "install" button in my app to run

    pe = pyenv
    app.PyversionEditField.Value = pe.Version   %to print the version of python
    [v,e] = pyversion; system([e,' -m pip install --user -U CoolProp'])     %to install CoolProp
          

it does the trick

Do you know how to run this three lines of code without having a button? I would like it to run whenever opening the app

[Mario Malic]

You can put it in StartupFcn callback.

Avoid using pyversion as that function is not recommended.

[Alexander Heinold]

I have exactly the same problem as you have, and it tried to solve it like you did. But unfortunately when compiling and installing my application on another computer, I am still not able to call the Coolprop command ("py.CoolProp.CoolProp.PropsSI..."). Instead I even get an error beforehand when trying to install Coolprop: It tells me that the command "-m" must be misspelled or can't be found. Python is installed, but somehow the command "system([e,' -m pip install --user -U CoolProp'])" can't be processed... have you had this error too? If so, what did you do in order to solve it?

My main PC runs MATLAB 2022a and Python 3.8.10.

My second PC where the application is supposed to run only runs Python 3.8.10.

Thank you for your help in advance!

[Giancarlo Meccariello]

Hello Alexander,

I installed anaconda on my computer. Try to run

pyversion C:\User\..\anaconda3\python.exe

When installing anaconda make sure to install it for "all users". I run into the same issue when anaconda was not installed for all users.

Let me know if you had any success.

[Alexander Heinold]

Thanks for the quick answer!

Ok, I installed Anaconda3 for "all users" - same problem.

I guess you mean I should run "pyversion C:\User\..\anaconda3\python.exe" on the PC with MATLAB, am I right? Or do you mean I should implement this code into my Code of my application?

Now it is Python 3.9, do you think it has something to do with the python version? Or even with MATLAB 2022a?

And: have you needed the above mentioned embeddable package? Because I haven't implemented it yet...

[Giancarlo Meccariello]

Install Anaconda for all users on the computer without MATLAB.

Include in StartupFCN callback (or "install button") these two lines.

  pe = pyenv
  [v,e] = pyversion; system([e,' -m pip install --user -U CoolProp'])     %to install CoolProp

Now everytime the application is started these lines are executet. You could even check the system if CoolProp already exist. If not install it. I would recommend that, it makes your application faster.

The approach with an "install button" is not bad, however, for the clients it could look cheap. Use the install button just for testing purposes.

[Alexander Heinold]

Thank you. I tried your code, but it errored. After a lot (!) of try and error I figured out, that I would need to change the code for automatically installing CoolProp a little bit:

pe = pyenv

[v,e] = pyversion; system([e,'python -m pip install --user -U CoolProp']) %to install CoolProp

Otherwise I would get the error, that the command "-m" is unfamiliar. My Python Version is 3.8.10 on every PC and it only worked when installing Python directly, not using Anaconda. But as you mentioned: directly installing CoolProp works faster and I would recommend it too.

Solved this problem, ran into the next one: When running the function

rho=py.CoolProp.CoolProp.PropsSI('D','T',...)

I get the error "Python commands require a supported version of CPython". Have you had this problem too?

[Alexander Heinold]

Edit: I had to set up my PC newly in order to make the code run - did nothing with the code, just reinstalled my main PC. Somehow - and I really don't know why - when compiling my application with it, the other PC's take the location of the installed Python version of the compiling PC. Because the location of Python on the compiling PC was another one than the one on the other PC's I got basically the message, that there was no Python on this PC, because the savepath it searched for - which did not exist on the other PC's - had no Python version in it.

Thank you for your help Giancarlo!

[Giancarlo Meccariello]

Glad you made it.

[Tazura1998]

Hi all,

I have the same problem as Alexander Heinold. Can some one help or Alexander what to do. I reinstall everything but have the same problem again CPython. I think i need to change the path on the other computer in CMD or powershell but i don't know how?

[Mario Malic]

Hi @Tazura1998, MATLAB has a setenv function which could be used in your case.

Answer 3

[hsin-yu]

I also encountered the same problem. I compiled the thermal property calculation APP on a computer with MATLAB, and packaged the APP and sent it to a user who did not have MATLAB. The user had python installed, but the python environment status was detected as not loaded. Therefore it cannot be calculated.

Is this because the APP cannot execute the command window ?

If the APP has this limitation, how to solve it?

------------------<my code>---------------------------------------------------------------

% Prompt the user for the Python installation directory and provide examples

default_python_dir = 'C:\Users\user\AppData\Local\Programs\Python\Python310\python.exe';

python_dir_cell = inputdlg('Please enter the directory where Python executable is located:', 'Python Directory', [1, 100], {default_python_dir});

python_dir = char(python_dir_cell);

% If the user cancels input, return

if isempty(python_dir)

return;

end

try

% Try to execute pyenv

pe = pyenv("Version", python_dir);

% Display Python environment information

disp(pe);

% Convert Python environment information to a string

pe_str = evalc('disp(pe)');

% Display Python environment information string

msgbox(pe_str, 'Python Environment');

% Determine whether to import CoolProp based on whether Python status is loaded

if strcmp(pe.Status, 'Loaded')

% Try to install CoolProp

[v, e] = pyversion;

cmd = [e, ' -m pip install --user -U CoolProp'];

system(cmd);

pause(0.1);

% Display success message box

msgbox('Connected successfully.', 'Success');

else

% Show error message box

msgbox('Python is not loaded. Please make sure Python version supports MATLAB.', 'Error');

end

catch ME

% If an error occurs, display an error message box

errorMessage = ME.message;

msgbox(errorMessage, 'Error', 'error');

end