Undefined variable "py" or class "py.numpy.array" when running MATLAB wrapper

[NeilwBailey]

When I try to run the MATLAB error, I get the following error, even though all the dependencies are installed and pyversion is correctly specified in MATLAB:

example_wrapper_multi_psd
Undefined variable "py" or class "py.numpy.array".

Error in fooof (line 37)
freqs = py.numpy.array(freqs);

Error in fooof_group (line 41)
cur_results = fooof(freqs, psd', f_range, settings);

Error in example_wrapper_multi_psd (line 21)
fooof_results = fooof_group(freqs, psds, f_range, settings);

[stahn76]

I installed Anaconda3 and got the same error above.
Apparently, Python provided by Anaconda sometimes is not working in MATLAB.
I just uninstalled Anaconda3 and install CPython instead and this seems to work.

[AntiLibrary5]

Install Python (Cpython) from python.org/downloads.
Make sure the version you download is 64-bit if your Matlab exe is 64-bit. By default, a 32-bit cersion of python is downloaded so be careful.
Open python and try the command "import numpy as np". If you get an error, you need to install the library. For this, go to command prompt and type (for python 3): "pip3 install numpy"
Now you will be able to use numpy library in matlab

[irenevigueguix]

Hey! I've got problems as well to launch Python into MATLAB, and I've successfully made it work (after spending the whole afternoon) by following your instructions together with other info that I found on the internet regarding the same problem with other Python packages. Yay! Also, I've created this tutorial for those who might have the same issues in the future and probably end up on this very page. I hope you find the tutorial useful and clearly explained!

[TomDonoghue]

Hey @viguix that tutorial blog post looks really cool - would it be okay if I link to it from the README so other people can find it more easily?

Also, sorry for the slow reply here, but if you've been trying out FOOOF through the wrapper or anything and have any questions etc, please do feel free to ask them!

[4srihy]

Hi, I got the same error. The easiest solution I found on internet is
first uninstall numpy by pip uninstall numpy
and then install it again with pip install numpy in anaconda command prompt.