[SciPy-user] read/write compressed files

Dominik Szczerba domi@vision.ee.ethz...
Wed Jun 20 15:18:26 CDT 2007

I got it (partially) working, but am not sure about optimality. In
particular, will fromstring copy memory into the array or decompress in
place? I think the former (how else would it know the size, and tell()
will be slow), but please correct me if I am wrong.

import gzip
fh = gzip.GzipFile("test.dat.gz", 'rb');
#ps = zeros(256*256) - will it help?
ps = fromstring(fh.read(), 'd')
ps.shape = (256,256)
fp = open('test.dat', 'wb')
io.numpyio.fwrite(fp, ps.size, ps)

- Dominik

Dominik Szczerba wrote:
> That works very well for ascii files, but I failed to figure out about
> binary data...
> Thanks for any hints,
> - Dominik
> Anne Archibald wrote:
>> On 20/06/07, Dominik Szczerba <domi@vision.ee.ethz.ch> wrote:
>>> Yes, I know it, but it does not return a scipy array, does it?
>>> Can I achieve it without copying memory? (I have huge arrays to process)
>> If the bz2 module will provide a file-like object, scipy.read_array
>> can read from that.
>> Anne
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Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich

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