Re: [Numpy-discussion] unpacking data values into array of bits

On Thu, Feb 12, 2015 at 2:21 PM, Neal Becker ndbecker2@gmail.com wrote:

I need to transmit some data values. These values will be float and long values. I need them encoded into a string of bits.

The only way I found so far to do this seems rather roundabout:

np.unpackbits (np.array (memoryview(struct.pack ('d', pi)))) Out[45]: array([0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1,

0,

   0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0,

0,

   0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0], dtype=uint8)

(which I'm not certain is correct)

Also, I don't know how to reverse this process

You already had your string ready for transmission with `struct.pack('d', pi)`.

-- Robert Kern