Passing path as input argument in matlab.engine

2023 6 17
1 个回答
回答已采纳
更新时间：2023 6 18
27 次查看（30 天）

0 个投票

I'm using the following lines of code to run main.m (I:/xxx/simcode/xxx/main) with path as input argument, using matlabe engine
import matlab.engine
eng = matlab.engine.start_matlab()
eng.run("I:/xxx/simcode/xxx/main, ['I:/xxx/xxxx/xxx/task5'])
eng.quit()
But I get an error,
self._result = pythonengine.getFEvalResult(self._future,self._nargout, None, out=self._out, err=self._err)
matlab.engine.MatlabExecutionError: Too many input arguments.
Could someone please suggest how to fix this?
I would like to run the main.m from python by passing an input argument which is a path.

请先登录，再回答此问题。

 采纳的回答

Steven Lord
Steven Lord 2023-6-18

1 个投票

The run function in MATLAB accepts only one input, the name of a script file. Is your main.m a script file or a function file? If the former it cannot accept input arguments; that's one of the defining characteristics of a script! If it's a function file, I think you can run it directly with something like (untested)
import matlab.engine
eng = matlab.engine.start_matlab()
eng.main("['I:/xxx/xxxx/xxx/task5']")
eng.quit()
Or if you need to change directories before calling your function, call cd then call feval in your MATLAB Engine session.
Note that I haven't used this functionality directly, I'm just going by what I see in the documentation.

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Deepa Maheshvare
Deepa Maheshvare 2023-6-18
编辑：Deepa Maheshvare 2023-6-18
Thanks a lot.
I tried,
import matlab.engine
eng = matlab.engine.start_matlab()
eng.main("['I:/xxx/xxxx/xxx/task5']")
eng.quit()
and unfortunately, I get the following error.
File "C:\Users\xxx\anaconda3\envs\xxxx\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)
matlab.engine.MatlabExecutionError: Too many output arguments.
I tried,
r =
eng.main("['I:/xxx/xxxx/xxx/task5']")
and I still get the same error.
main.m is a function which takes input argument TASK_DIR (path to a excel file) and it doesn't return any value.
function main(TASK_DIR)
To change to the directory in which main.m is saved, I was using
os.chdir(SIMULATOR_DIR)
Now, I have changed to
eng = matlab.engine.start_matlab()
eng.cd("I:/xxx/xxxx/factory", nargout=0)
eng.main(["I:/xxx/xxxx/xxx/task5"])
eng.quit()
for some reason I get the same error as reported above ( Too many output arguments).
I am not sure if nargot=0 is passed in the right place.
Could you please have a look? And could you also show an small example on how to use
`feval ` or `eval`? Can we use `nargout` in feval/eval?
Steven Lord
Steven Lord 2023-6-18
Try:
eng = matlab.engine.start_matlab()
eng.cd("I:/xxx/xxxx/factory", nargout=0)
eng.main(["I:/xxx/xxxx/xxx/task5"], nargout=0)
eng.quit()
Deepa Maheshvare
Deepa Maheshvare 2023-6-18
Thanks so much!
I don't get the error now.
If I may ask one last question,
There is minor issue :
main.m is present in I:/xxx/xxxx/factory
and main.m accesses a method in class io_utils which is in I:/xxx/xxxx/utils.
When running main.m in gui, I include all the subfolders in I:/xxx/xxxx/ to path.
However, I am not sure how to do the same while running from python.
I get the following error, I think the path to io_utils class is not recognized.
File I:\xxx\xxxx\factory\main.m, line 16, in main
Unable to resolve the name 'io_utils.get_task'.
Could you please suggest how the subfolders can be added to path?
Thanks a lot
Deepa Maheshvare
Deepa Maheshvare 2023-6-18
I think I should be using eng.addpath('/path/to/subfolder').

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Call MATLAB from Python 的更多信息

产品

版本

R2022b

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by