On Tue, Mar 1, 2011 at 18:40, Jon Olav Vik wrote:
> Robert Kern gmail.com> writes:
>> > Within a single machine, that sounds fine. What about processes running on
>> > different nodes, with different main memories?
>>
>> You mean mmaping a file on a shared file system?
>
> Yes. GPFS, I believe, p
Den 01.03.2011 14:20, skrev Jon Olav Vik:
> Use case: Generate "large" output for "many" parameter scenarios.
> 1. Preallocate "enormous" output file on disk.
>
That's not a usecase, because this will in general require 64-bit, for
which the offset parameter does not matter.
> Maybe that is impo
Robert Kern gmail.com> writes:
> > Within a single machine, that sounds fine. What about processes running on
> > different nodes, with different main memories?
>
> You mean mmaping a file on a shared file system?
Yes. GPFS, I believe, presumably this:
http://en.wikipedia.org/wiki/GPFS
Horrible
On Tue, Mar 1, 2011 at 17:06, Jon Olav Vik wrote:
> Robert Kern gmail.com> writes:
>> >> It's up to the virtual memory manager, but usually, it will just load
>> >> those pages (chunks the size of mmap.PAGESIZE) that are touched by
>> >> your request and write them back.
>> >
>> > What if two pro
Robert Kern gmail.com> writes:
> >> It's up to the virtual memory manager, but usually, it will just load
> >> those pages (chunks the size of mmap.PAGESIZE) that are touched by
> >> your request and write them back.
> >
> > What if two processes touch adjacent chunks that are smaller than a page?
On Tue, Mar 1, 2011 at 15:36, Jon Olav Vik wrote:
> Robert Kern gmail.com> writes:
>> >> >> You can have each of those processes memory-map the whole file and
>> >> >> just operate on their own slices. Your operating system's virtual
>> >> >> memory manager should handle all of the details for yo
Robert Kern gmail.com> writes:
> >> >> You can have each of those processes memory-map the whole file and
> >> >> just operate on their own slices. Your operating system's virtual
> >> >> memory manager should handle all of the details for you.
> >
> > Wow, I didn't know that. So as long as the ra
March EPD Webinar: How do I...solve ODEs? Part II
This Friday, Warren Weckesser will present a second installment of his
webinars on differential equations. We will explore two Python packages for
solving boundary value problems. Both are packaged as scikits:
scikits.bvp_solver, written by John S
Hi,
Thanks for the reply.
I think my problem will be to get some knowledge on some math subjects.
What kind of subjects in math I need to get knowledge to be able to
work in this field(indicators for financial products)?
Best Regards,
On Tue, Mar 1, 2011 at 7:17 PM, Christopher Barker
wrote
On 3/1/11 10:55 AM, Andre Lopes wrote:
> I'm not okay with linear interpolation.
Well, odds are that the crossing point won't be exactly at a data point,
so you need to do SOME kind of interpolation.
You could use a higher order interpolation (cubic spline, etc): see the
interpolation routines
Hi Joe,
Thanks for the reply.
I'm not okay with linear interpolation. Can you suggest me some books around
this subject. I will mainly try to build some indicator for the stock
market.
If you can give me a clue I would be appreciated.
Best Regards,
On Tue, Mar 1, 2011 at 5:23 PM, Joe Kington
Hi Andre,
Assuming that you want the exact point (date and value) where each crossing
occurs, you'll need to interpolate where they cross.
There are a number of different ways to do so, but assuming you're okay with
linear interpolation, and everything's sampled on the same dates, you can
simply
On Tue, Mar 1, 2011 at 8:07 AM, Andre Lopes wrote:
> Hi,
>
> I'm new to Numpy. I'm doing some tests with some Stock Market Quotes
>
> My struggle right now is "how to get the values of the moving averages
> crosses", I send an image in attach to illustrate what I'm trying to
> get.
>
> I'm using t
Hi,
I'm new to Numpy. I'm doing some tests with some Stock Market Quotes
My struggle right now is "how to get the values of the moving averages
crosses", I send an image in attach to illustrate what I'm trying to
get.
I'm using the this computation to get when the moving averages
crosses, but wh
On Tue, Mar 1, 2011 at 07:20, Jon Olav Vik wrote:
> Robert Kern gmail.com> writes:
>
>> On Mon, Feb 28, 2011 at 18:50, Sturla Molden molden.no> wrote:
>> > Den 01.03.2011 01:15, skrev Robert Kern:
>> >> You can have each of those processes memory-map the whole file and
>> >> just operate on thei
On Mon, Feb 28, 2011 at 10:52 PM, Wes McKinney wrote:
> On Mon, Feb 28, 2011 at 7:24 PM, Pierre GM wrote:
>>
>> On Mar 1, 2011, at 1:05 AM, Bruce Southey wrote:
>>
>>> On Mon, Feb 28, 2011 at 4:52 PM, Wes McKinney wrote:
I'm having some trouble with the zeros_like function via np.fix:
Advanced Scientific Programming in Python
=
a Summer School by the G-Node and the School of Psychology,
University of St Andrews
Scientists spend more and more time writing, maintaining, and
debugging software. While techniques for doing this efficiently h
Robert Kern gmail.com> writes:
> On Mon, Feb 28, 2011 at 18:50, Sturla Molden molden.no> wrote:
> > Den 01.03.2011 01:15, skrev Robert Kern:
> >> You can have each of those processes memory-map the whole file and
> >> just operate on their own slices. Your operating system's virtual
> >> memory
Neal Becker wrote:
> Can tensordot do this (or some other operator?)
>
> r[l,i,j] = \sum_k w[i,j,k] y[l,k]
Looks like
r = tensordot (w, y, axes=(2,1)) will produce r[i,j,l], so
transpose (r, (2,0,1))
will do it.
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Can tensordot do this (or some other operator?)
r[l,i,j] = \sum_k w[i,j,k] y[l,k]
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