[Numpy-discussion] Recurrence relationships

Talbot, Gerry Gerry.Talbot@amd....
Wed May 6 09:37:09 CDT 2009


The application is essentially filtering 1D arrays, typically N is
>20e6, the required result is y[1:N].

Gerry

-----Original Message-----
From: numpy-discussion-bounces@scipy.org
[mailto:numpy-discussion-bounces@scipy.org] On Behalf Of Alan G Isaac
Sent: Wednesday, May 06, 2009 10:25 AM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Recurrence relationships

On 5/6/2009 10:00 AM Talbot, Gerry apparently wrote:
> 	for n in xrange(1,N):
>           y[n] = A*x[n] + B*y[n-1]

So, x is known before you start?
How big is N? Also, is y.shape (N,)?
Do you need all of y or only y[N]?

Alan Isaac


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