Passing a string variable to matlab script from Python using the matlab Python API

Hi, This might be something really simple to someone who have done this, but i am struggling passing a string variable to matlab script from Python using the matlab Python API. I am doing this in 2017b

Here is what i have: 1. Matlab function: config = parseInputs(filename) %filename is a char array in matlab like "config.csv"

2. Python script file which attempts to call the above matlab function. I have saved my function parseInputs.m in the same directory as the python script.

Below is my python script:

import matlab.engine
eng = matlab.engine.start_matlab()
filename = "config.csv"
parameterMy = eng.parseInputs(filename, nargout=2)

I am getting an error like below:

File "C:\ProgramData\Anaconda3\lib\site-packages\matlab\engine\fevalfuture.py", line 82, in result
  self._result = pythonengine.getFEvalResult(self._future,self._nargout, None, out=self._out, err=self._err)

MatlabExecutionError: Undefined function 'parseInputs' for input arguments of type 'char'.

Any hint on how to make it work? Thanks!

[per isakson]

"a char array in matlab like "config.csv" " . Double or single quotes makes a difference

• "config.csv" is a scalar string
• 'config.csv' is a character array

However, that might not be relevant to the error you encounter.

Answer 1

[Eduardo Villalobos]

Hey,

did you manage to solve this?

Thanks!

Answer 2

[David Hocker]

I had a similar issue, and found that I didn't have the specific matlab function in my current working directory for my python code. Once I moved it there, I was able to get the command to execute. I also used python strings (double quotes, not single) for my string inputs.