[Numpy-discussion] unpacking bytes directly in numpy
Mon Sep 28 11:40:16 CDT 2009
David Cournapeau wrote:
>> However, is there a more direct way of directly transforming bytes
>> into a np.int32 type without the intermediate 'struct.unpack' step?
> Assuming you have an array of bytes, you could just use view:
> # x is an array of bytes, whose length is a multiple of 4
and if you don't have an array, you can use one of:
they all take a dtype as a parameter. For your example:
> bytes = f.read(4)
> i = struct.unpack('>i', bytes)
i = np.fromfile(f, dtype=np.int32, count=1)
and, of course, you cold read a lot more than one number in at once.
Christopher Barker, Ph.D.
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
More information about the NumPy-Discussion