Is it possible to run python code in matlab?

Sir, we have python code.Is it possible to run that code in matlab? If so kindly give guidelines.Thank you

[Wei Luo]

Try this!!!

Python Functions in MATLAB

Use Python® functions in MATLAB®, function signatures, arguments

To call a Python method or function, type py. followed by the module name, function name, and arguments.

In most cases, MATLAB automatically converts input arguments into Python types. An exception is calling a Python function with keyword arguments. Use the pyargs function to pass MATLAB data to these functions.

Answer 1

[Andrew Newell]

See Call Python function from MATLAB.

Answer 2

[manideep reddy]

You can call python script from matlab using the function

 system('python python_script.py');

in the same way, you can run a matlab script from python using the function os.system

 import os
print "I am in python"
os.system("matlab matlab_script.m")

[Nour Sd]

Thank you for your answer. I try it but I had this error:

AttributeError: 'module' object has no attribute 'imread'

Could you tell me what to do?

[Alberto Miranda]

try with cv2.imread

[Marco Delgado Gosálvez]

Yeah, if I try this it also does not work for me.

I have a very simple python script like follows (script saved as rat.py):

print("Hello world.")

import numpy as np

A = np.eye(2)
print(A)

I would now like to call this script from matlab. If I run it with the following code:

system('python rat.py');

I get the following error:

'python' is not recognized as an internal or external command, 
operable program or batch file. 

If I correct the matlab command like this:

system('rat.py');

Nothing happens. Only when I force Matlab to display something:

disp(system('python rat.py'));

I get:

Access is denied. 
     1.0000e+000

What am I doing wrong? I would love to make use of python more often, and use matlab only when I really have to.

[Samuel Bruce]

This is likely an error with your Python setup. If you go into Command Prompt and type "python" do you get the same error? If so, you have to add Python to your path, there are countless examples on how to do this out there. The basic idea is Control Panel>System and Security>System>Advanced system settings>Environment Variables then edit your path and add your Python directory so that your command line recognises python without being in the same directory as it.

[Bart McCoy]

Yes, that happens to me too.

If I try to run this, I get a similar message:

[status,result] = system('python test.py');

Almost certainly, if you fired up a command prompt and ran "python rat.py", you'd get the same response.... because your path doesn't have your python app in it.

SOLUTION:

1) Find out where it's installed.

For example, on my system, python.exe is installed here:

c:\apps\anaconda3\python.exe

2) So just modify your system call and add the full path, like this:

[status,result] = system('c:\apps\anaconda3\python test.py');

This worked for me

In general terms, you can almost always solve this by opening a system command prompt and find out exactly what you have to enter at the command prompt to get everything running. That's effectively what happens when you make a system call.

If you require multiple OS commands to run at the command prompt (changing dirs, etc), then put them all into 1 batch file (.bat) and execute the batch file.

[Nazeer]

Hi

This approch is working for me..thanks

wondering how to pass the arguments to the python function

[Kiavash Fathi]

Hello

Just pass them as you would in the terminal. As an example, for a function with one argument as:

def squared(x):

y = x * x

return y

You can run it as follows:

system('python sqd.py 1');

where sqd.py is the name of Python file containing the function.

I hope that helps

[Dedy Setiawan]

when I try this solution, I have found error.

Python was not found; run without arguments to install from the Microsoft Store, or disable this shortcut from Settings > Manage App Execution Aliases.

[Peter Herbert]

Depends on the types of python that you might have installed (check with 'python --version' in command prompt) - you might have to run 'python3 python_script.py' (you can also change the python alias to direct the version you want, or put a shebang header in the script). Other things to check are if you need a particular virtual environment with modules installed or you're using a default environment.

There is a lot of excellent help on setting up python and the likes on your local system in other forums (better than I could do here). The matlab command should work if you can get your python script to execute in a command prompt on your computer.

Hope that helps.

[Gopinath Karuppannan]

Hi

I have a source matlab script in folder 1 and i have python script and .mat file in folder 2. When i try to access the folder 2 data from folder 1 using the follow command i am getting error as No such file or directory. can someone guide me how to access the python file and .mat file from different current working directory.

Command used: system('python "folder 2/pythonfile.py"')

Error: FileNotFoundError: [Errno 2] No such file or directory: 'dr.mat'

[Vipul Dube]

What if its a python function with 2 arguments instead of a python script, how do I use system() in that case?

Answer 3

[Pierre Harouimi]

In R2021b, pyrun function allows you to run Python code directly from MATLAB.

Also, pyrunfile to run Python script.

[Sarukya Kastury]

I used pyrunfile in R2021b to run my python code, but it says:

Error using <string>><module> (line 1)

Python Error: ModuleNotFoundError: No module named 'numpy'

[Pierre Harouimi]

You probably have to import numpy because using it. Try reload the module:

clear classes
mod = py.importlib.import_module('mymod');
py.importlib.reload(mod);

[LEONARDO NUTI]

Hello,

I've python file that runs xgboost model. When I try to call it from MATLAB

pyrunfile("xgboost_model.py","matlab_return",x=trainData,y=testData)

It return error

Error using libpath>find_lib_path (line 67)

Python Error: XGBoostLibraryNotFound: Cannot find XGBoost Library in the candidate path. List of candidates:

- Library\mingw-w64\bin\xgboost.dll

- C:\Users\cepch\.conda\envs\aramco\lib\site-packages\xgboost\../../windows/x64/Release/xgboost.dll

- C:\Users\cepch\.conda\envs\aramco\lib\site-packages\xgboost\./windows/x64/Release/xgboost.dll

XGBoost Python package path: C:\Users\cepch\.conda\envs\aramco\lib\site-packages\xgboost

sys.prefix:

See: https://xgboost.readthedocs.io/en/latest/build.html for installing XGBoost.

Error in core>_load_lib (line 157)

Error in core><module> (line 203)

Error in __init__><module> (line 9)

Error in <string>><module> (line 1)

As you can see from message I've xgboost installed in my virt environment but MATALB doesn't sees it. Is there a way to fix this? Or I should reside to py.importlib?

[Dami Ajayi]

Hi, please did you find a solution to this? @LEONARDO NUTI

Thank you

[Pierre Harouimi]

@Dami Ajayi & @LEONARDO NUTI

I tried a simple xgboost python model and it worked well.

Maybe you did not import it in python? Is it a python error? You can check that: https://www.mathworks.com/help/matlab/matlab_external/troubleshooting-python-errors.html

You can try my example running:

preds = pyrunfile("xgboost_model.py", "preds")

You should have in output an ndarray.

Answer 4

[Steven Lord]

You might find this recent post on the "Loren on the Art of MATLAB" blog interesting and informative.