how to pass folder path to custom function using MATLAB engine API for python

Question

ARP 2022-9-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1807260-how-to-pass-folder-path-to-custom-function-using-matlab-engine-api-for-python

编辑： Divyam 2024-9-9，9:33

采纳的回答： Divyam

在 MATLAB Online 中打开

I have a funciton to load and process data in matlab, and I would like ot use it in python.

Using the matlab engine, I can call simple functions (standard and custom) that have input as double.

The problem is that when having the input a string(path folder), the funciton returns (0,0) and should be an array of many columns.

The Python code is below

Thanks in advance

import matlab.engine
import matlab
import numpy as np
eng = matlab.engine.start_matlab()
folder="D:\matlab results...."  # The folder path with text files to process
Amplitudes_all=eng.import_matlab_data(folder)  # function reads text files in selected folder and makes a 2D array with every file columnwise
ampsasarray=np.asarray(Amplitudes_all)
eng.quit()

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Answer 1

Divyam 2024-9-9，9:33

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1807260-how-to-pass-folder-path-to-custom-function-using-matlab-engine-api-for-python#answer_1513174

编辑：Divyam 2024-9-9，9:33

在 MATLAB Online 中打开

Hi @ARP,

MATLAB and Python handle strings differently and to ensure that folder path being passed is handled as a string in MATLAB, convert the variable "folder" to a MATLAB string before passing it to the MATLAB function.

folderPath = matlab.string(folder)
Amplitudes_all = eng.import_matlab_data(folderPath)

If the issue still persists, ensure that the folder path is correctly formatted and log data to ensure that the MATLAB function being called is returning the correct inputs at various steps.