title: Writing .npy (numpy binary format) from java
body: <p>Is there a library to create npy file in java?</p>
  
  <p>I'm looking for a method to write large matrices in java, to be read using python code.</p>
  
  <p>npy seems like a good option, as it doesn't add additional dependencies in the python side, and the format is documented.</p>
  
  <p>I considered hdf5 format, but the dependency on native libraries makes the deployment harder.</p>