On Fri, Apr 4, 2008 at 1:50 AM, Sebastian Haase <haase@msg.ucsf.edu> wrote:
Hi, Accidentally I'm exactly trying to do the same thing right now .....
What is the best way of memmapping into a file that is already open !?
I have to read some text (header info) off the beginning of the file before I know where the data actually starts. I could of course get the position at that point ( f.tell() ) close the file, and reopen using memmap. However this doesn't sound optimal to me ....
Any hints ? Could numpy's memmap be changed to also accept file-objects, or there a "rule" that memmap always has to have access to the entire file ?
I am getting a little tired, so this may be incorrect. But I believe Stefan modified memmaps to allow them to be created from file-like object: http://projects.scipy.org/scipy/numpy/changeset/4856 Are you running a released version of NumPy or the trunk? If you aren't using the trunk, could you give it a try? It would be good to have it tested before the 1.0.5 release. Cheers, -- Jarrod Millman Computational Infrastructure for Research Labs 10 Giannini Hall, UC Berkeley phone: 510.643.4014 http://cirl.berkeley.edu/