[Numpy-discussion] Inconsistent error messages.

2009-05-22 Thread Charles R Harris
Hi All, Currently fromfile prints a message raises a MemoryError when more items are requested than read, but fromstring raises a value error: In [8]: fromstring("", count=10) --- ValueErrorTra

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread David Warde-Farley
On 22-May-09, at 6:13 PM, Christopher Barker wrote: > that's why I put a sys.maxint at the end of the series... Oops! I foolishly assumed the sequence was unaltered. That makes a lot more sense. David ___ Numpy-discussion mailing list Numpy-discussio

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread Pierre GM
On May 22, 2009, at 6:15 PM, Christopher Barker wrote: > Pierre GM wrote: >> scikits.hydroclimpy.core.tools (hydroclimpy.sourceforge.net). > > whoa! Why didn't I ever see that before. Here I am , witting a whole > bunch of my own code to deal with time series of meteorological > data > argg

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread Christopher Barker
Pierre GM wrote: > scikits.hydroclimpy.core.tools (hydroclimpy.sourceforge.net). whoa! Why didn't I ever see that before. Here I am , witting a whole bunch of my own code to deal with time series of meteorological data argg! Now I need to go dig into that more. -Chris -- Christopher B

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread Christopher Barker
David Warde-Farley wrote: > I don't think this is very general: > > In [53]: indices > Out[53]: > array([ -3, 1, 2, 3, 4, 5, 6, 7, 8, > 9, 255, 256, 257, 258, 10001, 10002, 10003, 10004]) > > In [54]: breaks = diff(indices) != 1 > > In [55]:

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread josef . pktd
On Fri, May 22, 2009 at 3:59 PM, David Warde-Farley wrote: > On 22-May-09, at 1:03 PM, Christopher Barker wrote: > >> In [104]: zip(indices[np.r_[True, breaks[:-1]]], indices[breaks]) > > > > I don't think this is very general: > > In [53]: indices > Out[53]: > array([   -3,     1,     2,     3,  

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread Pierre GM
On May 22, 2009, at 12:31 PM, Andrea Gavana wrote: > Hi All, > >this should be a very easy question but I am trying to make a > script run as fast as possible, so please bear with me if the solution > is easy and I just overlooked it. > > I have a list of integers, like this one: > > indices

Re: [Numpy-discussion] Join us for "Scientific Computing with Python Webinar"

2009-05-22 Thread Eric Firing
Francesc Alted wrote: > A Wednesday 20 May 2009 16:45:12 Travis Oliphant escrigué: >> Hello all Python users: >> >> I am pleased to announce the beginning of a free Webinar series that >> discusses using Python for scientific computing. Enthought will host >> this free series which will take pla

Re: [Numpy-discussion] Join us for "Scientific Computing with Python Webinar"

2009-05-22 Thread Francesc Alted
A Wednesday 20 May 2009 16:45:12 Travis Oliphant escrigué: > Hello all Python users: > > I am pleased to announce the beginning of a free Webinar series that > discusses using Python for scientific computing. Enthought will host > this free series which will take place once a month for 30-45 > m

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread David Warde-Farley
On 22-May-09, at 1:03 PM, Christopher Barker wrote: > In [104]: zip(indices[np.r_[True, breaks[:-1]]], indices[breaks]) I don't think this is very general: In [53]: indices Out[53]: array([ -3, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 256, 257, 258,

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread Christopher Barker
Andrea Gavana wrote: > I have a list of integers, like this one: > > indices = [1,2,3,4,5,6,7,8,9,255,256,257,258,10001,10002,10003,10004] > >>From this list, I would like to find out which values are consecutive > and store them in another list of tuples (begin_consecutive, > end_consecutive) or

Re: [Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread josef . pktd
On Fri, May 22, 2009 at 12:31 PM, Andrea Gavana wrote: > Hi All, > >    this should be a very easy question but I am trying to make a > script run as fast as possible, so please bear with me if the solution > is easy and I just overlooked it. > > I have a list of integers, like this one: > > indic

[Numpy-discussion] List/location of consecutive integers

2009-05-22 Thread Andrea Gavana
Hi All, this should be a very easy question but I am trying to make a script run as fast as possible, so please bear with me if the solution is easy and I just overlooked it. I have a list of integers, like this one: indices = [1,2,3,4,5,6,7,8,9,255,256,257,258,10001,10002,10003,10004] >Fro

Re: [Numpy-discussion] numpy ufuncs and COREPY - any info?

2009-05-22 Thread Francesc Alted
A Friday 22 May 2009 13:52:46 Andrew Friedley escrigué: > (sending again) > > Hi, > > I'm the student doing the project. I have a blog here, which contains > some initial performance numbers for a couple test ufuncs I did: > > http://numcorepy.blogspot.com > > It's really too early yet to give def

Re: [Numpy-discussion] numpy ufuncs and COREPY - any info?

2009-05-22 Thread Francesc Alted
A Friday 22 May 2009 13:59:17 Andrew Friedley escrigué: > Using multiple cores is pretty easy for element-wise ufuncs; no > communication needs to occur and the work partitioning is trivial. And > actually I've found with some initial testing that multiple cores does > still help when you are memo

Re: [Numpy-discussion] numpy ufuncs and COREPY - any info?

2009-05-22 Thread Andrew Friedley
Francesc Alted wrote: > A Friday 22 May 2009 11:42:56 Gregor Thalhammer escrigué: >> dmitrey schrieb: >> 3) Improving performance by using multi cores is much more difficult. >> Only for sufficiently large (>1e5) arrays a significant speedup is >> possible. Where a speed gain is possible, the MKL

Re: [Numpy-discussion] numpy ufuncs and COREPY - any info?

2009-05-22 Thread Andrew Friedley
(sending again) Hi, I'm the student doing the project. I have a blog here, which contains some initial performance numbers for a couple test ufuncs I did: http://numcorepy.blogspot.com It's really too early yet to give definitive results though; GSoC officially starts in two days :) What I'

Re: [Numpy-discussion] Home for pyhdf5io?

2009-05-22 Thread Pauli Virtanen
Fri, 22 May 2009 10:00:56 +0200, Francesc Alted kirjoitti: [clip: pyhdf5io] > I've been having a look at your module and seems pretty cute. > Incidentally, there is another module module that does similar things: > > http://www.elisanet.fi/ptvirtan/software/hdf5pickle/index.html > > However, I d

Re: [Numpy-discussion] where are the benefits of ldexp and/or "array times 2"?

2009-05-22 Thread Francesc Alted
A Friday 22 May 2009 11:55:31 Gregor Thalhammer escrigué: > dmitrey schrieb: > > Hi all, > > I expected to have some speedup via using ldexp or multiplying an > > array by a power of 2 (doesn't it have to perform a simple shift of > > mantissa?), but I don't see the one. > > > > # Let me also note

Re: [Numpy-discussion] numpy ufuncs and COREPY - any info?

2009-05-22 Thread Francesc Alted
A Friday 22 May 2009 11:42:56 Gregor Thalhammer escrigué: > dmitrey schrieb: > > hi all, > > has anyone already tried to compare using an ordinary numpy ufunc vs > > that one from corepy, first of all I mean the project > > http://socghop.appspot.com/student_project/show/google/gsoc2009/python/t1 >

Re: [Numpy-discussion] where are the benefits of ldexp and/or "array times 2"?

2009-05-22 Thread Gregor Thalhammer
dmitrey schrieb: > Hi all, > I expected to have some speedup via using ldexp or multiplying an > array by a power of 2 (doesn't it have to perform a simple shift of > mantissa?), but I don't see the one. > > # Let me also note - > # 1) using b = 2 * ones(N) or b = zeros(N) doesn't yield any speedup

Re: [Numpy-discussion] numpy ufuncs and COREPY - any info?

2009-05-22 Thread Gregor Thalhammer
dmitrey schrieb: > hi all, > has anyone already tried to compare using an ordinary numpy ufunc vs > that one from corepy, first of all I mean the project > http://socghop.appspot.com/student_project/show/google/gsoc2009/python/t124024628235 > > It would be interesting to know what is speedup for (e

Re: [Numpy-discussion] Home for pyhdf5io?

2009-05-22 Thread Francesc Alted
Hello Albert, A Thursday 21 May 2009 22:32:10 escriguéreu: > Hi, > First of all thanks for your work on PyTables! I think it is excellent > and it has been really nice working with it. > > I'm writing this because i have developed a small python module that > uses pyTables: > > http://code.google.