How to read .npy files in Matlab

Question

I was wondering if there is way to read .npy files in Matlab? I know I can convert those to Matlab-style .mat files using scipy.io.savemat in Python; however I'm more interested in a native or plugin support for .npy files in Matlab.

Answer 1

This did the job for me, I used it to read npy files.

https://github.com/kwikteam/npy-matlab

If you only want to read .npy file all you need from the npy-matlab project are two files: readNPY.m and readNPYheader.m.

Usage is as simple as:

>> im = readNPY('/path/to/file.npy');

Answer 2

There is a c++ library available https://github.com/rogersce/cnpy

You could write a mex function to read the data. I would prefer to store everything in hdf5

Answer 3

A quick way would be to read it in python, as below,

data = np.load('/tmp/123.npz')

Then save it as '.csv', again by python, using python documentation or,

numpy.savetxt('FileName.csv', arrayToSave)

(more documentation here)

Finally, you can read it in MATLAB using the following command,

csvread()

Quick Update: As the user "Ender" mentioned in the comments, the csvread() is now deprecated and readmatrix() stands in its lieu. (documentation)