Getting h5py error for python

I am trying to load h5py module in matlab and I am getting this error:

Error using h5>init h5py.h5 (line 1)
Python Error: ImportError: DLL load failed: The specified procedure could not be found.

I installed the versio 3.2.1 of this package through python but can not load it in matlab. Anyone can help in this?

Answer 1

[Yongjian Feng]

1. Make sure you can use h5py in python first.
2. Check where it is installed. Then use setenv inside matlab to set the env var PYTHONPATH to point to that location.

[AsukaIkeda]

I have the same problem.

When I run "py.help('h5py')" in matlab(R2021b_update2) , I got the following error.

problem in h5py - ImportError: DLL load failed: 指定されたモジュールが見つかりません。

(The meaning of the last Japanese word is "The specified module was not found.")

1. I can use h5py in python script.
2. I set "C:\Users\(my user name)\Anaconda3\envs\tf37\Lib\site-packages\h5py" to PYTHONPATH , and restart the computer. But I got the same error in matlab. *"tf37" is my environment name.

pyenv returns the following values:

Version: "3.7"

Executable: "C:\Users\(my user name)\Anaconda3\envs\tf37\python.exe"

Library: "C:\Users\(my user name)\Anaconda3\envs\tf37\python37.dll"

Home: "C:\Users\(my user name)\Anaconda3\envs\tf37"

Status: Loaded

ExecutionMode: InProcess

ProcessID: "12684"

ProcessName: "MATLAB"

I know that matlab is incompatible with Anaconda, but If anyone knows how to do this, please let me know.　Thanks.

[Yongjian Feng]

Inside matlab, check the PYTHONPATH env as well. It might not be the same as the one of the system.

In matlab command line, type

getenv('PYTHONPATH')

To add path, in matlab command line

setenv('PYTHONPATH', new_path)

[AsukaIkeda]

@Yongjian Feng Thank you for the answer, and sorry I didn't notice your comment.

I tried your command inside matlab. But it still didn't work.

This is my matlab setup.

getenv('PYTHONPATH')

ans = 'C:\Users\(my user name)\anaconda3\envs\tf37\lib\site-packages\h5py'

However, I found the another solution.

I copied the following DLL files

from "C:\Users\(my user name)\anaconda3\envs\tf37\Library\bin"

to "C:\Users\(my user name)\anaconda3\envs\tf37\Lib\site-packages\h5py" .

cilkrts20.dll

concrt140.dll

hdf5.dll

hdf5_cpp.dll

hdf5_hl.dll

hdf5_hl_cpp.dll

hdf5_tools.dll

ifdlg100.dll

libchkp.dll

libicaf.dll

libifcoremd.dll

libifcorert.dll

libifportmd.dll

libirngmd.dll

libmmd.dll

libmpx.dll

msvcp140.dll

svml_dispmd.dll

szip.dll

vcruntime140.dll

zlib.dll

https://github.com/h5py/h5py/issues/1914#issuecomment-871312615

for numpy, I also made the following settings.

https://jp.mathworks.com/matlabcentral/answers/427187-problem-with-python-numpy#answer_345308

[Yongjian Feng]

I see. Matlab can find the python package, but has trouble to find the dependent dll. Maybe you can set the PATH env var to point to those dll.