A Monday 11 February 2008, Charles R Harris escrigué:
On Feb 11, 2008 1:15 PM, Francesc Altet [EMAIL PROTECTED] wrote:
Here are the results of running it in several platforms:
1) My laptop: Ubuntu 7.1 (gcc 4.1.3, Pentium 4 @ 2 GHz)
Benchmark with 100 strings of size 15
C qsort with
On 12/02/2008, Matthew Brett [EMAIL PROTECTED] wrote:
Suggestion 1:
def median(a, axis=0, out=None)
[...]
Suggestion 2:
def median(a, axis=0, scratch_input=False)
No reason not to combine the two. It's a pretty straightforward
modification to do the sorting in place, and it could make a lot
--- Albert Strasheim [EMAIL PROTECTED] wrote:
Hello,
Sounds about right. I don't know the Mac that well
as far as the
various types of dynamic libraries go, so just check
that you're
working with the right type of libraries, but you've
got the right
idea.
Regards,
Albert
Thanks,
--- Jon Wright [EMAIL PROTECTED] wrote:
Lou Pecora wrote:
... This appears to be the way
static and shared libraries work, especially on
Mac OS
X, maybe elsewhere.
Have you tried linking against a GSL static library?
I don't have a mac,
but most linkers only pull in the routines
On 12/02/2008, Matthew Brett [EMAIL PROTECTED] wrote:
Is it possible, in fact, to do an inplace sort on an array with
axis=None (ie flat sort)?
It is, sometimes; just make an array object to point to the flattened
version and sort that:
In [16]: b = a[:]
In [17]: b.shape = (16,)
In [18]:
On 12/02/2008, Anne Archibald [EMAIL PROTECTED] wrote:
An efficient way to handle in-place (or out-of-place, come to think of
it) median along multiple axes is actually to take medians along all
axes in succession. That saves you some sorting effort, and some
programming effort, and doesn't
Hi,
To rephrase:
Is it possible, in fact, to do an inplace sort on an array with
axis=None (ie flat sort)?
Should the sort method have its docstring changed to reflect the fact
that axis=None is not valid?
Matthew
On Feb 10, 2008 7:50 PM, Matthew Brett [EMAIL PROTECTED] wrote:
Hi,
I just
Hi,
On Feb 12, 2008 8:48 PM, Anne Archibald [EMAIL PROTECTED] wrote:
On 12/02/2008, Matthew Brett [EMAIL PROTECTED] wrote:
Suggestion 1:
def median(a, axis=0, out=None)
[...]
Suggestion 2:
def median(a, axis=0, scratch_input=False)
No reason not to combine the two. It's a pretty
Hi,
I have a Opteron 248 (2.66GHz) that with gcc 4.1.0 (SUSE10.1?) that gives
C qsort with C style compare: 0.65
C qsort with Python style compare: 0.64
NumPy newqsort: 0.36
I did notice that -O3 was essential to get the performance gain as -O2 gave:
C qsort with C style compare:
Lou Pecora wrote:
--- Jon Wright [EMAIL PROTECTED] wrote:
Lou Pecora wrote:
... This appears to be the way
static and shared libraries work, especially on
Mac OS
X, maybe elsewhere.
Have you tried linking against a GSL static library?
I don't have a mac,
but most linkers only pull in
On Feb 12, 2008 9:07 AM, Francesc Altet [EMAIL PROTECTED] wrote:
A Monday 11 February 2008, Charles R Harris escrigué:
I'll check it out when I get home. As I say, it was running about 10%
slower on my machine, but if it does better on most platforms it is
probably the way to go. We can
OK,
The new quicksorts are in svn. Francesc, can you check them out?
Chuck
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Hello,
On Feb 12, 2008 6:19 PM, Lou Pecora [EMAIL PROTECTED] wrote:
Albert,
Yes, I think you got the idea right. I want to call my own C code using
CTypes interface, then from within my C code call GSL C code, i.e. a C
function calling another C function directly. I do *not* want to go
On Feb 12, 2008 6:33 AM, Joris De Ridder
[EMAIL PROTECTED] wrote:
On 12 Feb 2008, at 12:31, Matthew Brett wrote:
def median(a, axis=0, out=None)
(same signature as max, min etc)
I would be slightly in favour of this option.
Using the same signature would be convenient in code like
def
Lou Pecora wrote:
... This appears to be the way
static and shared libraries work, especially on Mac OS
X, maybe elsewhere.
Have you tried linking against a GSL static library? I don't have a mac,
but most linkers only pull in the routines you need. For example, using
windows and mingw:
Albert Strasheim [EMAIL PROTECTED] wrote: Hello,
I only quickly read through the previous thread, but I get that idea
that what you want to do is to link your shared library against the
the GSL shared library and then access your own library using ctypes.
If done like this, you don't need to
First, thanks to all who answered my questions about
trying to use a large library with CTypes and my own
shared library. The bottom line seems to be this:
There is no way to incorporate code external to your
own shared library. You have to either pull out the
code you want from the static
Damian, Lots of good info there. Thanks very much.
-- Lou
--- Damian Eads [EMAIL PROTECTED] wrote:
Dear Lou,
You may want to try using distutils or setuputils,
which makes compiling
extensions much easier. It does the hard work of
finding out which flags
are needed to compile
On 12 Feb 2008, at 12:31, Matthew Brett wrote:
def median(a, axis=0, out=None)
(same signature as max, min etc)
I would be slightly in favour of this option.
Using the same signature would be convenient in code like
def myfunc(myarray, somefunc):
# do stuff
...
x =
As for me, it yields lots of inconveniences (lots of my code should be
rewritten, since I didn't know it before):
from numpy import *
a = array((1.0, 2.0), float128)
b=asfarray(a)
type(a[0])
#type 'numpy.float128'
type(b[0])
#type 'numpy.float64'
__version__
'1.0.5.dev4767'
Shouldn't it be
On Tue, February 12, 2008 7:52 am, Garry Willgoose wrote:
I have a suite of fortran modules that I want to wrap with f2py
independently (so they appear to python as seperate imports) but
where each module has access to another fortran module (which
contains global data that is shared between
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