Pyrunfile input from Matlab workspace

Hello,

I'm trying to get data via a python code using a dll. I already have access but only for specific files, running with

Outvars = pyrunfile(file input, outputs)

Now I want the filname that is used in python as an input parameter from matlab like:

fileName = 'C:/...';
Outvars = pyrunfile("file" fileName, outputs);

Is this somehow possible?

Another idea is not to use pyrunfile but creating a module in python and then calling the functions with py.my_function() but then I don't know how to initialize the database-access with the changing fileName. So I would still need to change the filename in the python module script.

Answer 1

[Infinite_king]

Hi,

I understand that you want to execute a Python script from MATLAB and pass a filename stored in the MATLAB workspace as an input parameter to the Python script.

You can achieve this by using ‘pyrunfile’ function. The first argument of ‘pyrunfile’ function should be a string containing python script name followed by input arguments. Refer the below code snippet,

% file name stored in MATLAB variable
file_name = "<path>";

% python file name
python_file_name = "python_prog.py";

% create a string with python script name followed by input arguments
str = python_file_name + " " + file_name;

% displaying the string
disp(str);

% calling python file by passing matlab variable as argument
pyrunfile(str);

The python script will receive these inputs as strings. For example let’s consider above example, the script ‘python_prog’ will receive ‘<path>’ as a string.

For more information on how to use ‘pyrunfile’ function, refer the following documentation.

• https://www.mathworks.com/help/matlab/ref/pyrunfile.html#:~:text=hello-,Pass%20Command%20Line%20Arguments%20to%20Python%20Script,-Create%20a%20Python

Hope this is helpful.