2008/5/1 Travis E. Oliphant <[EMAIL PROTECTED]>:
> Stéfan van der Walt wrote:
> > 2008/4/30 Christopher Barker <[EMAIL PROTECTED]>:
> >
> >> Stéfan van der Walt wrote:
> >> > That's the way, or just rgba_image.view(numpy.int32).
> >>
> >> ah -- interestingly, I tried:
> >>
> >> rgba_imag
On Thu, May 1, 2008, Travis E. Oliphant wrote:
> You are just seeing the result of __repr__. The printing code works by
> accessing slices of the array. These slices create new instances of
> your TestArray class which have a smaller number of dimensions. That's all.
Ahh, that makes sense. Th
Travis E. Oliphant wrote:
> Stéfan van der Walt wrote:
>> 2008/4/30 Christopher Barker <[EMAIL PROTECTED]>:
>>> Since it is optional, shouldn't it be keyword argument?
>>>
>> Thanks, fixed in r5115.
>>
>>
> This was too hasty. I had considered this before.
>
> The problem with this is t
ctw wrote:
> Hi!
>
> I ran into some strange (at least to me) issues with sublasses of
> ndarray. The following minimal class definition illustrates the
> problem:
>
>
>
> import numpy as np
> class TestArray(np.ndarray):
> def __new__(cls, d
On Wed, Apr 30, 2008 at 9:16 PM, Anne Archibald <[EMAIL PROTECTED]>
wrote:
> 2008/4/30 Charles R Harris <[EMAIL PROTECTED]>:
>
> > Some operations on stacks of small matrices are easy to get, for
> instance,
> > +,-,*,/, and matrix multiply. The last is the interesting one. If A and
> B
> > are st
Stéfan van der Walt wrote:
> 2008/4/30 Christopher Barker <[EMAIL PROTECTED]>:
>
>> Stéfan van der Walt wrote:
>> > That's the way, or just rgba_image.view(numpy.int32).
>>
>> ah -- interestingly, I tried:
>>
>> rgba_image.view(dtype=numpy.int32)
>>
>> and got:
>>
>> Traceback (most recent
Hi!
I ran into some strange (at least to me) issues with sublasses of
ndarray. The following minimal class definition illustrates the
problem:
import numpy as np
class TestArray(np.ndarray):
def __new__(cls, data, info=None, dtype=None, co
On Wed, Apr 30, 2008 at 8:16 PM, Anne Archibald <[EMAIL PROTECTED]>
wrote:
> 2008/4/30 Charles R Harris <[EMAIL PROTECTED]>:
>
> > Some operations on stacks of small matrices are easy to get, for
> instance,
> > +,-,*,/, and matrix multiply. The last is the interesting one. If A and B
> > are stac
2008/4/30 Charles R Harris <[EMAIL PROTECTED]>:
> Some operations on stacks of small matrices are easy to get, for instance,
> +,-,*,/, and matrix multiply. The last is the interesting one. If A and B
> are stacks of matrices with the same number of dimensions with the matrices
> stored in the las
On Wed, 2008-04-30 at 16:44 -0300, Lisandro Dalcin wrote:
> David, in order to put clear what I was proposing to you in previous
> mail regarding to implementing plugin systems for numpy, please take a
> look at the attached tarball.
Thanks for looking at this Lisandro.
The problem I see with the
2008/4/30 Christopher Barker <[EMAIL PROTECTED]>:
> Stéfan van der Walt wrote:
> > That's the way, or just rgba_image.view(numpy.int32).
>
> ah -- interestingly, I tried:
>
> rgba_image.view(dtype=numpy.int32)
>
> and got:
>
> Traceback (most recent call last):
>File "", line 1, in
> Typ
On Tue, Apr 29, 2008 at 1:22 PM, Timothy Hochberg <[EMAIL PROTECTED]>
wrote:
>
> Let me throw out a couple of more thoughts:
>
> First, there seems to be disagreement about what a row_vector and
> column_vector are (and even if they are sensible concepts, but let's leave
> that aside for moment).
Stéfan van der Walt wrote:
> That's the way, or just rgba_image.view(numpy.int32).
ah -- interestingly, I tried:
rgba_image.view(dtype=numpy.int32)
and got:
Traceback (most recent call last):
File "", line 1, in
TypeError: view() takes no keyword arguments
Since it is optional, shouldn't i
Sorry, I forgot to attach the code...
On 4/30/08, Lisandro Dalcin <[EMAIL PROTECTED]> wrote:
> David, in order to put clear what I was proposing to you in previous
> mail regarding to implementing plugin systems for numpy, please take a
> look at the attached tarball.
>
> The plugins are in ch
David, in order to put clear what I was proposing to you in previous
mail regarding to implementing plugin systems for numpy, please take a
look at the attached tarball.
The plugins are in charge of implementing the action of generic foo()
and bar() functions in C. The example actually implements
On Wednesday 30 April 2008 15:25:43 Charles Doutriaux wrote:
> that's exactly my understanding thanks for confirming
Fixed in 1.1.0dev5114
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that's exactly my understanding thanks for confirming
C.
Pierre GM wrote:
> Charles,
>
>
>> but not:
>> import numpy.ma as MA
>> a0= MA.array(0)/0
>> a1= MA.array((0,0))/0
>>
>> Is that a bug ?
>>
>
> That a0 is MA.masked is not a bug. That a1 should be a (2,) array masked
> everywhere s
Hi Chris
2008/4/30 Christopher Barker <[EMAIL PROTECTED]>:
> Someone on the wxPython list posted a nifty recarray example that I
> don't quite understand. The idea is to have an array for an RGBA image:
>
> rgbarec = numpy.dtype({'r':(numpy.uint8,0),
> 'g':(numpy.uint8,1
On Wed, Apr 30, 2008 at 11:57:44AM -0700, Christopher Barker wrote:
> I think I still like the idea of an iterator (or maybe making rollaxis a
> method?), but this works pretty well.
Generally, in object oriented programming, you expect a method like
rollaxis to modify an object inplace. At least
Charles,
> but not:
> import numpy.ma as MA
> a0= MA.array(0)/0
> a1= MA.array((0,0))/0
>
> Is that a bug ?
That a0 is MA.masked is not a bug. That a1 should be a (2,) array masked
everywhere should work, but does not: that's the bug. Thanks for reporting.
__
Christopher Barker wrote:
> Hi folks,
>
> Someone on the wxPython list posted a nifty recarray example that I
> don't quite understand. The idea is to have an array for an RGBA image:
>
> rgbarec = numpy.dtype({'r':(numpy.uint8,0),
> 'g':(numpy.uint8,1),
>
Anne Archibald wrote:
>> it's much easier to just write
>
> for subarray in np.rollaxis(A,i):
> ...
cool, thanks! So the answer to the OPs question:
> OK: how do i iterate over an axis other than 0?
>
> I have a 3D array of data[year, week, location]. I want to iterate
> over each year at
HI,
import numpy.oldnumeric.ma as MA
a0= MA.array(0)/0
sh0=list(a0.shape)
sh0.insert(0,1)
b0=MA.resize(a0,sh0)
Does not work anymore, I believe it used to work
It does works using numpy.ma (but i can't subclass these yet...)
C.
___
Numpy-discussion
Hello i have a quick question about MA ans scalar
the following works:
import numpy.ma as MA
a0= MA.array(0)/1
a1= MA.array((0,0))/1
but not:
import numpy.ma as MA
a0= MA.array(0)/0
a1= MA.array((0,0))/0
Is that a bug ?
I'm using numpy 1.0.5.dev4958 and also whats in trunk right now
(1.1.0.dev
Hi folks,
Someone on the wxPython list posted a nifty recarray example that I
don't quite understand. The idea is to have an array for an RGBA image:
rgbarec = numpy.dtype({'r':(numpy.uint8,0),
'g':(numpy.uint8,1),
'b':(numpy.uint8,2),
2008/4/30 Christopher Barker <[EMAIL PROTECTED]>:
> a g wrote:
> > OK: how do i iterate over an axis other than 0?
>
> This ties in nicely with some of the discussion about interating over
> matrices. It ahs been suggested that it would be nice to have iterators
> for matrices, so you could do:
a g wrote:
> OK: how do i iterate over an axis other than 0?
This ties in nicely with some of the discussion about interating over
matrices. It ahs been suggested that it would be nice to have iterators
for matrices, so you could do:
for row in M.rows:
...
and
for column in M.cols:
...
Bill Spotz wrote:
> On Apr 29, 2008, at 6:01 PM, Keith Goodman wrote:
>> break most any package based on matrices (mine). And so I hope that
>> such a change wouldn't show up, if at all, until 2.0.
>
> The only code that should break would be indexing the extracted row/
> column with two indexes.
Greetings,
Just a reminder: the abstracts for the EuroSciPy Conference in Leipzig
are due by midnight tonight (CST, US [UTC -6]) April, 30. If you'd
like to present, please submit your abstract as a PDF, MS Word or
plain text file to [EMAIL PROTECTED]
For more information on the EuroSciPy
On Apr 29, 2008, at 6:01 PM, Keith Goodman wrote:
> I hope that changing x[0,:] is considered a major change since it will
> break most any package based on matrices (mine). And so I hope that
> such a change wouldn't show up, if at all, until 2.0.
The only code that should break would be indexin
Hi Alex,
a g wrote:
> Hi. This is a very basic question, sorry if it's irritating. If i
> didn't find the answer written already somewhere on the site, please
> point me to it. That'd be great.
You should look at any of the documents below and read up on array
slicing. It is perhaps the most
2008/4/30 a g <[EMAIL PROTECTED]>:
> Hi. This is a very basic question, sorry if it's irritating. If i
> didn't find the answer written already somewhere on the site, please
> point me to it. That'd be great.
>
> OK: how do i iterate over an axis other than 0?
>
> I have a 3D array of data[y
for i in range(52):
week_data = data[:,i,:]
OR
for week_data in data.transpose(1,0,2):
...
Nadav
-הודעה מקורית-
מאת: [EMAIL PROTECTED] בשם a g
נשלח: ד 30-אפריל-08 11:11
אל: numpy-discussion@scipy.org
נושא: [Numpy-discussion] very simple iteration question.
Hi. This is a ver
2008/4/29 Alan G Isaac <[EMAIL PROTECTED]>:
> As I was looking at Bill's conjugate gradient posting,
> I found myself wondering if there would be a payoff
> to an output argument for ``numpy.outer``. (It is fairly
> natural to repeatedly recreate the outer product of
> the adjusted residuals,
Hi. This is a very basic question, sorry if it's irritating. If i
didn't find the answer written already somewhere on the site, please
point me to it. That'd be great.
OK: how do i iterate over an axis other than 0?
I have a 3D array of data[year, week, location]. I want to iterate
over each
On Tue, Apr 29, 2008 at 4:41 PM, Anne Archibald <[EMAIL PROTECTED]>
wrote:
> Timothy Hochberg has proposed a generalization of the matrix mechanism
> to support manipulating arrays of linear algebra objects. For example,
> one might have an array of matrices one wants to apply to an array of
> vec
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