2008/10/30 Robert Kern <[EMAIL PROTECTED]>:
> Provide a kind of inaccessible and invisible dtype for implementing
> dummy fields. This is useful in other places like file parsing. At the
> same time, implement a function that uses this capability to make
> views with a subset of the fields of a str
Hi Fernando,
Thanks for your input.
2008/10/29 Fernando Perez <[EMAIL PROTECTED]>:
> I think it's fine to ask for functions that compute higher order
> derivatives of n-d arrays: we already have diff(), which operates on a
> single direction, and a hessian could make sense (with the caveats
> Dav
Hello,
I'm working on seismic processing software called Globe Claritas. The
core is written in C and a bit of Fortran. I would like to embed
Python in this software, so a user can use Python code to manipulate
the seismic data. This would give our users all the power of Python
and NumPy and an
On Wed, Oct 29, 2008 at 22:37, Alan G Isaac <[EMAIL PROTECTED]> wrote:
> On 10/29/2008 3:43 PM Robert Kern wrote:
>> The defining characteristic is
>> that "x = y" should be equivalent to "x = x y" except
>> possibly for *optional* in-place semantics.
>
> This gets at a bit of the Language Referen
On 10/29/2008 3:43 PM Robert Kern wrote:
> The defining characteristic is
> that "x = y" should be equivalent to "x = x y" except
> possibly for *optional* in-place semantics.
This gets at a bit of the Language Reference that I've
never understood.
when possible, the actual operation
On Wed, Oct 29, 2008 at 19:05, Travis E. Oliphant
<[EMAIL PROTECTED]> wrote:
>
> Hi all,
>
> I'd like to add to NumPy the ability to clone a data-type object so that
> only a view fields are copied over but that it retains the same total size.
>
> This would allow, for example, the ability to "sele
Hi all,
I'd like to add to NumPy the ability to clone a data-type object so that
only a view fields are copied over but that it retains the same total size.
This would allow, for example, the ability to "select out a few records"
from a structured array using
subarr = arr.view(cloned_dtype)
On 29-Oct-08, at 3:43 PM, Robert Kern wrote:
> Eh, that's not entirely true.
>
> x = 1
> x += 2
>
> That's not in-place. They are called "augmented assignments", not
> "in-place operations" for this reason. The defining characteristic is
> that "x = y" should be equivalent to "x = x y" except
>
I'm having some trouble getting NaN's to return from f77 code running under
latest f2py in both g77 and gfortran. I would prefer to use gfortran but
whenever I set a result value = NAN, it comes back to Python as 0. Has
anyone tackled this issue? I am new to using f2py, have been moving along
fine
On Wed, Oct 29, 2008 at 14:33, Eric Firing <[EMAIL PROTECTED]> wrote:
> David Warde-Farley wrote:
>> Hi Fernando,
>>
>> In Robert's comment, I think the reST processor somehow got rid of a
>> backslash. In my browser I see
>>
>> (I'm looking at you, Matlab's "")
>>
>> although this is an asid
David Warde-Farley wrote:
> Hi Fernando,
>
> In Robert's comment, I think the reST processor somehow got rid of a
> backslash. In my browser I see
>
> (I'm looking at you, Matlab's "")
>
> although this is an aside that will be lost on anyone who hasn't used
> the Matlab backslash oper
Howdy,
Minor comment on all this, from the peanut gallery...
Without commenting on the original gradient API or changes, I'm a
strong -1000 on introducing the notion of 'order' into a gradient
function. The gradient, from every definition I can remember, is a
first-order operation. Matlab's gra
2008/10/29 Andrew Hawryluk <[EMAIL PROTECTED]>:
> Any chance of using the proposed API with the existing name? What is
> deemed sufficient justification for modifying the API of an existing
> NumPy function? It causes trouble for existing users, but the number of
> future users exceeds the number o
Hey David,
On Wed, Oct 29, 2008 at 2:00 AM, David Warde-Farley <[EMAIL PROTECTED]> wrote:
> Hi Fernando,
>
> In Robert's comment, I think the reST processor somehow got rid of a
> backslash. In my browser I see
>
>(I'm looking at you, Matlab's "")
>
> although this is an aside that will be
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:numpy-discussion-
> [EMAIL PROTECTED] On Behalf Of Robert Kern
> Sent: 28 Oct 2008 3:36 PM
> To: Discussion of Numerical Python
> Subject: Re: [Numpy-discussion] any interest in including asecond-
> ordergradient?
>
> On Tue, Oct 28, 2
On Wednesday 29 October 2008 01:44:06 Adam wrote:
> In [62]: temp2d = reshape(array3d,[23*337,107])
>
> In [63]: temp2d2 = zeros([23*337,144])
>
> In [64]: temp2d2[:,f.bolo_indices] = temp2d
>
> In [65]: array2d[whscan,:] = temp2d2
>
>
> This works, but it feels wrong to me: I think there should be
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:numpy-discussion-
> [EMAIL PROTECTED] On Behalf Of David Warde-Farley
> Sent: 28 Oct 2008 10:15 PM
> To: Discussion of Numerical Python
> Subject: Re: [Numpy-discussion] any interest in includinga second-
> ordergradient?
>
> On 28-Oct
> In [85]: bi = (f.bolo_indices[np.newaxis,:]+
>
> ones([7751,1])).astype('int')
>
> In [86]: whc = (whscan[:,np.newaxis] + ones([1,107])).astype('int')
>
> In [87]: array2d[whc,bi] = temp2d
>
> I thought this had worked, but the values didn't seem to be going to the
> right places when I re-exami
I'm pleased to announce the release of NumPy 1.2.1.
NumPy is the fundamental package needed for scientific computing with
Python. It contains:
* a powerful N-dimensional array object
* sophisticated (broadcasting) functions
* basic linear algebra functions
* basic Fourier transforms
* sophi
Hi Fernando,
In Robert's comment, I think the reST processor somehow got rid of a
backslash. In my browser I see
(I'm looking at you, Matlab's "")
although this is an aside that will be lost on anyone who hasn't used
the Matlab backslash operator anyway.
In fact, one other thing jus
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