You can. If each number occupies 2 bytes (16 bits) it is straight forward. If it is a continues 12 bits stream you have to unpack by your self: data = np.fromstring(str12bits, dtype=np.uint8) data1 = data.astype(no.uint16) data1[::3] = data1[::3]*256 + data1[1::3] // 16 data1[1::3] = (data[1::3] & 0x0f)*16 + data[2::3]
If you have even number of 12 bits you can continue as the follows: result = np.ravel(data1.reshape(-1,3)[:,:2]) I might have mistakes, but I hope you grasped the idea. Nadav -----Original Message----- From: numpy-discussion-boun...@scipy.org on behalf of Martin Raspaud Sent: Tue 08-Jun-10 15:04 To: Discussion of Numerical Python Subject: [Numpy-discussion] Reading 12bits numbers ? -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, Is it possible to read an array of 12bit encoded numbers from file (or string) using numpy ? Thanks, Martin -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJMDjG6AAoJEBdvyODiyJI4ksQH/01OMIm59V3XDpcWv6oYTSBw zFZ/Q7mtyvHhTC9LQAgBWsIrdVze2qZP8Azsv73VjHx8QggTI8Z++U7v1HuHNyhs CAT7DsSLYKcNC4sZ2tCkMNfTQZ8Xm0hTxObylr+V98LcPO+CSjRyERZSA0S3+X6A xPZlRKLNErIGqMWiyr25r7wjuYPTK8iICqYdzZI33w7eZPcMtvP40GNDUaG7aOno mcMwSzPHnKHCuPlfj3p2rCkDs5OEhmEP9fobVIhR0Y7LxusrewPuTlwL1M+e/tqe Uf0Drjymo9i3d0VqCKAKBwd9d0kJPzVCbbwQnynu87cOj9CjwhiZ4lFufc+S+m4= =CrwA -----END PGP SIGNATURE-----
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