On 1/27/2009 6:03 AM, Jochen wrote:
BTW memmap arrays have
the same problem
if I create a memmap array and later do something like
a=a+1
all later changes will not be written to the file.
= is Python's rebinding operator.
a = a + 1 rebinds a to a different object.
As for ndarray's, I'd
On 1/27/2009 1:26 AM, Jochen wrote:
a = fftw3.AlignedArray(1024,complex)
a = a+1
= used this way is not assignment, it is name binding.
It is easy to use function's like fftw_malloc with NumPy:
import ctypes
import numpy
fftw_malloc = ctypes.cdll.fftw.fftw_malloc
fftw_malloc.argtypes =
On 1/27/2009 12:37 PM, Sturla Molden wrote:
address = fftw_malloc(N * d.nbytes) # restype = ctypes.c_ulong
if (address = 0):
if (address == ): raise MemoryError, 'fftw_malloc returned NULL'
Sorry for the typo.
S.M.
___
On 1/27/2009 12:37 PM, Sturla Molden wrote:
It is easy to use function's like fftw_malloc with NumPy:
Besides this, if I were to write a wrapper for FFTW in Python, I would
consider wrapping FFTW's Fortran interface with f2py.
It is probably safer, as well as faster, than using ctypes. It
On 1/27/2009 12:37 PM, Sturla Molden wrote:
import ctypes
import numpy
fftw_malloc = ctypes.cdll.fftw.fftw_malloc
fftw_malloc.argtypes = [ctypes.c_ulong,]
fftw_malloc.restype = ctypes.c_ulong
def aligned_array(N, dtype):
d = dtype()
address = fftw_malloc(N * d.nbytes) #
On Tue, 2009-01-27 at 12:37 +0100, Sturla Molden wrote:
On 1/27/2009 1:26 AM, Jochen wrote:
a = fftw3.AlignedArray(1024,complex)
a = a+1
= used this way is not assignment, it is name binding.
It is easy to use function's like fftw_malloc with NumPy:
import ctypes
import numpy
On Tue, 2009-01-27 at 14:16 +0100, Sturla Molden wrote:
On 1/27/2009 12:37 PM, Sturla Molden wrote:
import ctypes
import numpy
fftw_malloc = ctypes.cdll.fftw.fftw_malloc
fftw_malloc.argtypes = [ctypes.c_ulong,]
fftw_malloc.restype = ctypes.c_ulong
def aligned_array(N, dtype):
On Tue, 2009-01-27 at 14:16 +0100, Sturla Molden wrote:
def aligned_array(N, dtype):
d = dtype()
tmp = numpy.array(N * d.nbytes + 16, dtype=numpy.uint8)
address = tmp.__array_interface__['data'][0]
offset = (16 - address % 16) % 16
return
Hi all,
I just wrote ctypes bindings to fftw3 (see
http://projects.scipy.org/pipermail/scipy-user/2009-January/019557.html
for the post to scipy).
Now I have a couple of numpy related questions:
In order to be able to use simd instructions I
create an ndarray subclass, which uses fftw_malloc
Jochen wrote:
Hi all,
I just wrote ctypes bindings to fftw3 (see
http://projects.scipy.org/pipermail/scipy-user/2009-January/019557.html
for the post to scipy).
Now I have a couple of numpy related questions:
In order to be able to use simd instructions I
create an ndarray subclass,
On Mon, 2009-01-26 at 19:25 -0600, Ryan May wrote:
Jochen wrote:
Hi all,
I just wrote ctypes bindings to fftw3 (see
http://projects.scipy.org/pipermail/scipy-user/2009-January/019557.html
for the post to scipy).
Now I have a couple of numpy related questions:
In order to be
Jochen wrote:
On Tue, 2009-01-27 at 12:49 +0900, David Cournapeau wrote:
Jochen wrote:
Hi all,
I just wrote ctypes bindings to fftw3 (see
http://projects.scipy.org/pipermail/scipy-user/2009-January/019557.html
for the post to scipy).
Now I have a couple of numpy related
On Tue, 2009-01-27 at 13:28 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 12:49 +0900, David Cournapeau wrote:
Jochen wrote:
Hi all,
I just wrote ctypes bindings to fftw3 (see
http://projects.scipy.org/pipermail/scipy-user/2009-January/019557.html
Jochen wrote:
On Tue, 2009-01-27 at 13:28 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 12:49 +0900, David Cournapeau wrote:
Jochen wrote:
Hi all,
I just wrote ctypes bindings to fftw3 (see
On Tue, 2009-01-27 at 13:54 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 13:28 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 12:49 +0900, David Cournapeau wrote:
Jochen wrote:
Hi all,
I just wrote
Jochen wrote:
On Tue, 2009-01-27 at 13:54 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 13:28 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 12:49 +0900, David Cournapeau wrote:
Jochen
On Tue, 2009-01-27 at 14:46 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 13:54 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at 13:28 +0900, David Cournapeau wrote:
Jochen wrote:
On Tue, 2009-01-27 at
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