At 07:45 AM 2/12/2015, you wrote:
Robert Kern wrote:
def tobeckerbits(x): return np.unpackbits(np.frombuffer(np.asarray(x), dtype=np.uint8)).astype(np.int32)
def frombeckerbits(bits, dtype): return np.frombuffer(np.packbits(bits), dtype=dtype)[0]
-- Robert Kern
Nice! Also seems to work for arrays of values:
It's also fastest, with most pushed to numpy:
s='np.unpackbits(np.frombuffer(np.asarray(np.pi),
dtype=np.uint8)).astype(np.int32)'
timr(s)
0.000252470827292
s="np.array([b for b in
bin(struct.unpack('!i',struct.pack('!f',1.0))[0])[2:]], 'int32')"
timr(s)
0.000513665240078
s="np.unpackbits (np.array (memoryview(struct.pack ('d',
np.pi)))).astype(np.int32)"
timr(s)
0.000466455247988
s="np.array([b for b in np.binary_repr(314159)], 'int32')" timr(s)
0.000423350472602