SciPy Recipes

Storing several arrays in binary format

The savez() function allows for the saving of several arrays in the same file. In the following code, we generate arrays with random data and store them to the disk:

x = np.random.rand(200, 300)y = np.random.rand(30)z = np.random.rand(10, 5, 7)np.savez('arrays_xyz.npz', xfile=x, yfile=y, zfile=z)

This code performs the following steps:

• Generates files in NPY format, holding each of the arrays x, y, and z. These files are named, respectively, xfile, yfile, and zfile.
• Creates a single ZIP archive containing the NPY files generated for each array.
• Saves the archive to the disk in a file named arrays_xyz.npz.

Since the generated archive is a ZIP file, it can be opened with any standard archiving utility. ...