Re: [Numpy-discussion] Problem with correlate

On Thu, Jun 4, 2009 at 5:14 AM, David Cournapeau wrote: > On Tue, Jun 2, 2009 at 10:56 PM, Ryan May wrote: > > On Tue, Jun 2, 2009 at 5:59 AM, David Cournapeau > > wrote: > >> > >> Robin wrote: > >> > On Tue, Jun 2, 2009 at 11:36 AM, David Cournapeau > > >> > wrote: > >> > > >> >> Done in r703

Re: [Numpy-discussion] Problem with correlate

On Tue, Jun 2, 2009 at 10:56 PM, Ryan May wrote: > On Tue, Jun 2, 2009 at 5:59 AM, David Cournapeau > wrote: >> >> Robin wrote: >> > On Tue, Jun 2, 2009 at 11:36 AM, David Cournapeau >> > wrote: >> > >> >> Done in r7031 - correlate/PyArray_Correlate should be unchanged, and >> >> acorrelate/PyAr

Re: [Numpy-discussion] Problem with correlate

> I wonder if xcorrelate would be a better name than acorrelate? I think it would. ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion

Re: [Numpy-discussion] Problem with correlate

Charles R Harris wrote: > > > > I also think that having weighting options would be good. I now > understand the complexities of the various > weightings that can be applied to the correlation i.e. biased vs > unbiased but I think that having correlate > include these options m

Re: [Numpy-discussion] Problem with correlate

On Tue, Jun 2, 2009 at 1:16 PM, rob steed wrote: > > I also think that the conjugate should be taken. I spent the last few weeks > using correlate to experiment with > signal processing and I got strange results until I realised that I had to > manually take the conjugate. It > would also be good

Re: [Numpy-discussion] Problem with correlate

I also think that the conjugate should be taken. I spent the last few weeks using correlate to experiment with signal processing and I got strange results until I realised that I had to manually take the conjugate. It would also be good if the function did it since applying the conjugate to th

Re: [Numpy-discussion] Problem with correlate

On Tue, Jun 2, 2009 at 5:59 AM, David Cournapeau < da...@ar.media.kyoto-u.ac.jp> wrote: > Robin wrote: > > On Tue, Jun 2, 2009 at 11:36 AM, David Cournapeau > wrote: > > > >> Done in r7031 - correlate/PyArray_Correlate should be unchanged, and > >> acorrelate/PyArray_Acorrelate implement the conv

Re: [Numpy-discussion] Problem with correlate

Robin wrote: > On Tue, Jun 2, 2009 at 11:36 AM, David Cournapeau wrote: > >> Done in r7031 - correlate/PyArray_Correlate should be unchanged, and >> acorrelate/PyArray_Acorrelate implement the conventional definitions, >> > > I don't know if it's been discussed before but while people are

Re: [Numpy-discussion] Problem with correlate

On Tue, Jun 2, 2009 at 11:36 AM, David Cournapeau wrote: > > Done in r7031 - correlate/PyArray_Correlate should be unchanged, and > acorrelate/PyArray_Acorrelate implement the conventional definitions, I don't know if it's been discussed before but while people are thinking about/changing correla

Re: [Numpy-discussion] Problem with correlate

On Tue, Jun 2, 2009 at 12:37 PM, David Cournapeau wrote: > Robert Kern wrote: >>> This does not solve the C function problem (PyArray_Correlate). The easy >>> solution would be to keep the current C version, deal with the problem >>> in python for acorrelate for the time being, and replace the old

Re: [Numpy-discussion] Problem with correlate

Robert Kern wrote: >> This does not solve the C function problem (PyArray_Correlate). The easy >> solution would be to keep the current C version, deal with the problem >> in python for acorrelate for the time being, and replace the old C >> function with the 'correct' one once we remove the deprec

Re: [Numpy-discussion] Problem with correlate

On Mon, Jun 1, 2009 at 22:33, David Cournapeau wrote: > Charles R Harris wrote: >> >> >> On Mon, Jun 1, 2009 at 11:48 AM, Charles R Harris >> mailto:charlesr.har...@gmail.com>> wrote: >> >> >> >>     On Mon, Jun 1, 2009 at 10:35 AM, Robert Kern >>     mailto:robert.k...@gmail.com>> wrote: >> >>  

Re: [Numpy-discussion] Problem with correlate

Charles R Harris wrote: > > > On Mon, Jun 1, 2009 at 11:48 AM, Charles R Harris > mailto:charlesr.har...@gmail.com>> wrote: > > > > On Mon, Jun 1, 2009 at 10:35 AM, Robert Kern > mailto:robert.k...@gmail.com>> wrote: > > On Mon, Jun 1, 2009 at 00:05, David Cournapeau >

Re: [Numpy-discussion] Problem with correlate

On Mon, Jun 1, 2009 at 13:44, Charles R Harris wrote: > > > On Mon, Jun 1, 2009 at 11:48 AM, Charles R Harris > wrote: >> >> >> On Mon, Jun 1, 2009 at 10:35 AM, Robert Kern >> wrote: >>> >>> On Mon, Jun 1, 2009 at 00:05, David Cournapeau >>> wrote: >>> >>> > I think we should just fix it to use

Re: [Numpy-discussion] Problem with correlate

On Mon, Jun 1, 2009 at 11:48 AM, Charles R Harris wrote: > > > On Mon, Jun 1, 2009 at 10:35 AM, Robert Kern wrote: > >> On Mon, Jun 1, 2009 at 00:05, David Cournapeau >> wrote: >> >> > I think we should just fix it to use conjugate - I will do this in the >> > branch, and I will integrate it in

Re: [Numpy-discussion] Problem with correlate

On Mon, Jun 1, 2009 at 10:35 AM, Robert Kern wrote: > On Mon, Jun 1, 2009 at 00:05, David Cournapeau > wrote: > > > I think we should just fix it to use conjugate - I will do this in the > > branch, and I will integrate it in the trunk later unless someone stands > > up vehemently against the ch

Re: [Numpy-discussion] Problem with correlate

On Mon, Jun 1, 2009 at 00:05, David Cournapeau wrote: > I think we should just fix it to use conjugate - I will do this in the > branch, and I will integrate it in the trunk later unless someone stands > up vehemently against the change. I opened up a ticket to track this, > though, It breaks ev

Re: [Numpy-discussion] Problem with correlate

Charles R Harris wrote: > > > On Sun, May 31, 2009 at 9:08 PM, David Cournapeau > mailto:da...@ar.media.kyoto-u.ac.jp>> > wrote: > > Charles R Harris wrote: > > > > > > On Sun, May 31, 2009 at 7:18 PM, David Cournapeau > > >

Re: [Numpy-discussion] Problem with correlate

On Sun, May 31, 2009 at 9:08 PM, David Cournapeau < da...@ar.media.kyoto-u.ac.jp> wrote: > Charles R Harris wrote: > > > > > > On Sun, May 31, 2009 at 7:18 PM, David Cournapeau > > mailto:da...@ar.media.kyoto-u.ac.jp>> > > wrote: > > > > Charles R Harris wrote: > > > > > > > > > On

Re: [Numpy-discussion] Problem with correlate

Charles R Harris wrote: > > > On Sun, May 31, 2009 at 7:18 PM, David Cournapeau > mailto:da...@ar.media.kyoto-u.ac.jp>> > wrote: > > Charles R Harris wrote: > > > > > > On Sun, May 31, 2009 at 11:54 AM, rob steed > >

Re: [Numpy-discussion] Problem with correlate

On Sun, May 31, 2009 at 7:18 PM, David Cournapeau < da...@ar.media.kyoto-u.ac.jp> wrote: > Charles R Harris wrote: > > > > > > On Sun, May 31, 2009 at 11:54 AM, rob steed > > wrote: > > > > > > Hi, > > After my previous email, I have opened a ticket #1117 (corre

Re: [Numpy-discussion] Problem with correlate

Charles R Harris wrote: > > > On Sun, May 31, 2009 at 11:54 AM, rob steed > wrote: > > > Hi, > After my previous email, I have opened a ticket #1117 (correlate > not order dependent) > > I have found that the correlate function is defined in > multiar

Re: [Numpy-discussion] Problem with correlate

On Sun, May 31, 2009 at 11:54 AM, rob steed wrote: > > Hi, > After my previous email, I have opened a ticket #1117 (correlate not order > dependent) > > I have found that the correlate function is defined in multiarraymodule.c > and > that inputs are being swapped using the following code > >

[Numpy-discussion] Problem with correlate

Hi, After my previous email, I have opened a ticket #1117 (correlate not order dependent) I have found that the correlate function is defined in multiarraymodule.c and that inputs are being swapped using the following code n1 = ap1->dimensions[0]; n2 = ap2->dimensions[0]; if (n1 < n

Re: [Numpy-discussion] Problem with correlate

2009/5/18 Stéfan van der Walt : > 2009/5/18 rob steed : >> This works fine. However, if the arrays have different lengths, we get a >> problem. >> > y2=N.array([0,0,0,1]) > N.correlate(x,y2,'full') > > This looks like a bug to me. > > In [54]: N.correlate([1, 0, 0, 0], [0, 0, 0, 1],'full')

Re: [Numpy-discussion] Problem with correlate

2009/5/18 rob steed : > This works fine. However, if the arrays have different lengths, we get a > problem. > y2=N.array([0,0,0,1]) N.correlate(x,y2,'full') This looks like a bug to me. In [54]: N.correlate([1, 0, 0, 0], [0, 0, 0, 1],'full') Out[54]: array([1, 0, 0, 0, 0, 0, 0]) In [5

[Numpy-discussion] Problem with correlate

Hi all, I have been using numpy.correlate and was finding something weird. I now think that there might be a bug. Correlations should be order dependent eg. correlate(x,y) != correlate(y,x) in general (whereas convolutions are symmetric) >>> import numpy as N >>> x = N.array([1,0,0]) >>> y =

Re: [Numpy-discussion] Problem with correlate?

Hi Stefan, I checked it with numpy version 1.1.1 just now and the result is the same: >>> x = N.array([0.,0,1,0,0]) >>> y1 = N.array([1.,0,0,0,0]) >>> N.correlate(x,y1, mode='full') array([ 0., 0., 0., 0., 0., 0., 1., 0., 0.]) >>> y2 = N.array([1.,0,0,0,0,0,0]) >>> N.correlate(x,y2, mode

Re: [Numpy-discussion] Problem with correlate?

Hi Hanno 2008/8/22 Hanno Klemm <[EMAIL PROTECTED]>: > yes, indeed, that's what I thought. This result is odd. Has correlate > been changed since version 1.0.4, or should I submit this as a bug? Is there any way that you could try out the latest release on your machine and see if it solves your pr

Re: [Numpy-discussion] Problem with correlate?

Hi Stefan, yes, indeed, that's what I thought. This result is odd. Has correlate been changed since version 1.0.4, or should I submit this as a bug? Best regards, Hanno Stéfan van der Walt <[EMAIL PROTECTED]> said: > --=_Part_25307_10322093.1219268954678 > Content-Type: text/plain; charset

Re: [Numpy-discussion] Problem with correlate?

2008/8/20 Hanno Klemm <[EMAIL PROTECTED]>: > In [29]: x = array([0.,0.,1, 0, 0]) > In [35]: y1 = array([1,0,0,0,0]) > > In [36]: correlate(x,y1,mode='full') > Out[36]: array([ 0., 0., 0., 0., 0., 0., 1., 0., 0.]) That doesn't look right. Under r5661: In [60]: np.convolve([0, 0, 1, 0, 0],

[Numpy-discussion] Problem with correlate?

Hi All, after the discussion on numpy.correlate some time ago, regarding complex conjugation, etc. I today was pointed to yet another oddity, which I hope somebody could explain to me, as to why that's a feature, rather than a bug. I'm thoroughly confused by the following behaviour: In [29]: