On Tue, Jun 30, 2009 at 12:31 PM, Russell E. Owen wrote:
> In article
> ,
> Charles R Harris wrote:
>
> > On Mon, Jun 29, 2009 at 4:17 PM, Russell E. Owen
> > wrote:
> >
> > > In article
> > > ,
> > > Charles R Harris wrote:
> > >
> > > > On Mon, Jun 29, 2009 at 3:03 PM, Russell E. Owen
> > >
On Tue, Jun 30, 2009 at 2:02 PM, David Goldsmith wrote:
>
> No, but my guess is that it might be useful in numerical General
> Relativity, e.g., as well as pedagogically in teaching differential geometry
> and tensor algebra.
>
> DG
>
It shouldn't be difficult to generate all the permutations of
No, but my guess is that it might be useful in numerical General Relativity,
e.g., as well as pedagogically in teaching differential geometry and tensor
algebra.
DG
--- On Tue, 6/30/09, Nils Wagner wrote:
> From: Nils Wagner
> Subject: Re: [Numpy-discussion] permutation symbol
> To: "Discus
On Tue, Jun 30, 2009 at 12:26 PM, Nils Wagner
wrote:
> On Tue, 30 Jun 2009 11:10:39 -0600
> Charles R Harris wrote:
> > On Tue, Jun 30, 2009 at 10:56 AM, Charles R Harris <
> > charlesr.har...@gmail.com> wrote:
> >
> >>
> >>
> >> On Tue, Jun 30, 2009 at 10:40 AM, Nils Wagner <
> >> nwag...@iam.
On Tue, Jun 30, 2009 at 12:31 PM, Russell E. Owen wrote:
> In article
> ,
> Charles R Harris wrote:
>
> > On Mon, Jun 29, 2009 at 4:17 PM, Russell E. Owen
> > wrote:
> >
> > > In article
> > > ,
> > > Charles R Harris wrote:
> > >
> > > > On Mon, Jun 29, 2009 at 3:03 PM, Russell E. Owen
> > >
On Tue, Jun 30, 2009 at 12:30 PM, David Goldsmith
wrote:
>
> Great, Nils! Now, can you generalize it to N-D for us? ;-)
>
>
It's generally better to use the exterior calculus, determinants, and
various other tricks.
Chuck
___
Numpy-discussion mailing l
On Tue, 30 Jun 2009 11:30:51 -0700 (PDT)
David Goldsmith wrote:
>
> Great, Nils! Now, can you generalize it to N-D for us?
>;-)
>
> DG
Just curious - Do you have any application for N-D case in
mind ?
Nils
___
Numpy-discussion mailing list
Num
On Tue, Jun 30, 2009 at 12:26 PM, Nils Wagner
wrote:
> On Tue, 30 Jun 2009 11:10:39 -0600
> Charles R Harris wrote:
> > On Tue, Jun 30, 2009 at 10:56 AM, Charles R Harris <
> > charlesr.har...@gmail.com> wrote:
> >
> >>
> >>
> >> On Tue, Jun 30, 2009 at 10:40 AM, Nils Wagner <
> >> nwag...@iam.
In article
,
Charles R Harris wrote:
> On Mon, Jun 29, 2009 at 4:17 PM, Russell E. Owen
> wrote:
>
> > In article
> > ,
> > Charles R Harris wrote:
> >
> > > On Mon, Jun 29, 2009 at 3:03 PM, Russell E. Owen
> > > wrote:
> > >
> > > > I have an old Numarray C extension (or, rather, a Python
Great, Nils! Now, can you generalize it to N-D for us? ;-)
DG
--- On Tue, 6/30/09, Nils Wagner wrote:
> From: Nils Wagner
> Subject: Re: [Numpy-discussion] permutation symbol
> To: "Discussion of Numerical Python"
> Date: Tuesday, June 30, 2009, 11:26 AM
> On Tue, 30 Jun 2009 11:10:39 -0600
Hi! I can't help but wonder if - out there somewhere - there's an optimized
algorithm for implementing the general N-D Permutation Symbol:
"The symbol can be generalized to an arbitrary number of elements, in which
case the permutation symbol is (-1)^(i(p)), where i(p) is the number of
transp
On Tue, 30 Jun 2009 11:10:39 -0600
Charles R Harris wrote:
> On Tue, Jun 30, 2009 at 10:56 AM, Charles R Harris <
> charlesr.har...@gmail.com> wrote:
>
>>
>>
>> On Tue, Jun 30, 2009 at 10:40 AM, Nils Wagner <
>> nwag...@iam.uni-stuttgart.de> wrote:
>>
>>> On Tue, 30 Jun 2009 10:27:05 -0600
>>>
On Tue, Jun 30, 2009 at 10:56 AM, Charles R Harris <
charlesr.har...@gmail.com> wrote:
>
>
> On Tue, Jun 30, 2009 at 10:40 AM, Nils Wagner <
> nwag...@iam.uni-stuttgart.de> wrote:
>
>> On Tue, 30 Jun 2009 10:27:05 -0600
>> Charles R Harris wrote:
>> > On Tue, Jun 30, 2009 at 5:11 AM, Nils Wagner
On Tue, Jun 30, 2009 at 10:40 AM, Nils Wagner
wrote:
> On Tue, 30 Jun 2009 10:27:05 -0600
> Charles R Harris wrote:
> > On Tue, Jun 30, 2009 at 5:11 AM, Nils Wagner
> > wrote:
> >
> >> On Tue, 30 Jun 2009 11:22:34 +0200
> >> "Nils Wagner" wrote:
> >>
> >>> Hi all,
> >>>
> >>> How can I build
On Tue, 30 Jun 2009 10:27:05 -0600
Charles R Harris wrote:
> On Tue, Jun 30, 2009 at 5:11 AM, Nils Wagner
> wrote:
>
>> On Tue, 30 Jun 2009 11:22:34 +0200
>> "Nils Wagner" wrote:
>>
>>> Hi all,
>>>
>>> How can I build the following product with numpy
>>>
>>> q_i = \varepsilon_{ijk} q_{kj}
>>
On Tue, Jun 30, 2009 at 5:11 AM, Nils Wagner
wrote:
> On Tue, 30 Jun 2009 11:22:34 +0200
> "Nils Wagner" wrote:
>
>> Hi all,
>>
>> How can I build the following product with numpy
>>
>> q_i = \varepsilon_{ijk} q_{kj}
>>
>> where \varepsilon_{ijk} denotes the permutation symbol.
>>
>> Nils
>>
>
On Tue, 30 Jun 2009 11:22:34 +0200
"Nils Wagner" wrote:
Hi all,
How can I build the following product with numpy
q_i = \varepsilon_{ijk} q_{kj}
where \varepsilon_{ijk} denotes the permutation symbol.
Nils
Sorry for replying to myself.
The permutation symbol is also known as the Levi-Civ
Hi all,
How can I build the following product with numpy
q_i = \varepsilon_{ijk} q_{kj}
where \varepsilon_{ijk} denotes the permutation symbol.
Nils
http://mathworld.wolfram.com/PermutationSymbol.html
___
Numpy-discussion mailing list
Numpy-discus
18 matches
Mail list logo
