Annaconda packages not loadable in Matlab

Dear learned friends,

I installed Annaconda 3 and set up a virtual environment with some customised packages (called "matlab"). I tried to load Python libraries such as numpy and matplotlib to use in Matlab. I know how to change the environment from "base" to "matlab" by using pyversion(...), but it is weird that no packages such as numpy or matplotlib can be loaded in the environment (though the other standard packages such as list and tuple do work). I then tried my "base" environment, but those packages did not work either. Any help would be greatly appreciated.

Best,

Peng

Answer 1

[Peng Zhou]

I worked out the solution myself, but still thank Yongjian Feng for your kind help. To share my solution with those who have the same need. Run the following code:

% Load packages from conda environment
clear
path = pyenv;  % python environment parameters
pyRoot = char(fileparts(path.Executable));  % set the root path of python
p = strsplit(getenv('PATH'), ';');  % obtain the original path of matlab
addToPath = {
    pyRoot
    fullfile(pyRoot,'Library','mingw-w64','bin')
    fullfile(pyRoot,'Library','usr','bin')
    fullfile(pyRoot,'Library','bin')
    fullfile(pyRoot,'Scripts')
    fullfile(pyRoot,'bin')};  % generate python library path
setenv('PATH',strjoin(unique([addToPath(:);p(:)],'stable'), ';'));  % add to path

Answer 2

[Yongjian Feng]

Did you try to set the env var PYTHONPATH?

[Peng Zhou]

Sorry, could you inform how to use pythonpath please?

[Yongjian Feng]

It is just an environment variable. It needs to point to the location of your installed packages like numpy.

Follow this:

https://www.mathworks.com/help/matlab/ref/setenv.html

But in general, virtualenv could be tricky.

[Peng Zhou]

Do you mean type something like:

setenv('pythonpath','C:\anaconda3\lib\site-packages')

But it still does not work. Could you please give me an example? Sorry for my ignorance.