Re: Determinant of Large Matrix

2007-06-08 Thread Hendrik van Rooyen
"James Stroud" wrote: > James Stroud wrote: > [pointless stuff] > > OK. Nevermind. I'm rebinding encodings and so taking a sample from the > sample and thus getting the sample back. Terribly sorry. There is truly nothing to be sorry about. It takes guts to come right out and say that you made

Re: Determinant of Large Matrix

2007-06-07 Thread Mark Westwood
Hi James Mathematica says that the determinant of the integer version of this matrix is 2774532096, which is another vote for the answer you have. Mathematica says that the determinant of the 24-digit real version of your matrix is 2.774532096*10^9, which looks very similar to me. I'd go with Nu

Re: Determinant of Large Matrix

2007-06-07 Thread Bjoern Schliessmann
James Stroud wrote: > If I run it again on 10 (or 1000) the set is basically homogenous > but now of different values (terribly confusing): > > set([12048175104.1, 12048175104.15, 12048175104.46, > 12048175103.94, 12048175104.23, 12048175103.81, > 12048175103.98, 12048

Re: Determinant of Large Matrix

2007-06-06 Thread James Stroud
James Stroud wrote: [pointless stuff] OK. Nevermind. I'm rebinding encodings and so taking a sample from the sample and thus getting the sample back. Terribly sorry. James -- http://mail.python.org/mailman/listinfo/python-list

Re: Determinant of Large Matrix

2007-06-06 Thread James Stroud
Steven D'Aprano wrote: [Valuable Response] Thank you Steven for your helpful comments. Please see my reply to Bjoern Schliessmann where I have restated my problem. James -- http://mail.python.org/mailman/listinfo/python-list

Re: Determinant of Large Matrix

2007-06-06 Thread James Stroud
Hello, Thank you to those who responded for your answers. They were very helpful and I'm confident now that numpy is calculating accurate determinants for these matrices. But I think I need to restate my problem a little as suggested by some becuase I'm still bewildered. First, here is the re

Re: Determinant of Large Matrix

2007-06-06 Thread Steven D'Aprano
On Wed, 06 Jun 2007 04:10:43 -0700, James Stroud wrote: > Hello All, > > I'm using numpy to calculate determinants of matrices that look like > this (13x13): [snip matrix] > For this matrix, I'm getting this with numpy: > > 2774532095.971 > > But I have a feeling I'm exceeding the capa

Re: Determinant of Large Matrix

2007-06-06 Thread Bjoern Schliessmann
James Stroud wrote: > For this matrix, I'm getting this with numpy: > > 2774532095.971 > > But I have a feeling I'm exceeding the capacity of floats here. > Does anyone have an idea for how to treat this? Not if you don't state your requirements more precisely. E. g. what precision do you n

Re: Determinant of Large Matrix

2007-06-06 Thread Peter Otten
James Stroud wrote: > I'm using numpy to calculate determinants of matrices that look like > this (13x13): > > [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] > [ 1. 0. 1. 4. 1. 9. 4. 4. 1. 1. 4. 9. 4. 9.] > [ 1. 1. 0. 1. 4. 4. 9. 9. 4. 4. 1. 4. 1. 4.] >

Re: Determinant of Large Matrix

2007-06-06 Thread Robert Kern
James Stroud wrote: > Hello All, > > I'm using numpy to calculate determinants of matrices that look like > this (13x13): > > [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] > [ 1. 0. 1. 4. 1. 9. 4. 4. 1. 1. 4. 9. 4. 9.] > [ 1. 1. 0. 1. 4. 4. 9. 9. 4. 4. 1.

Re: Determinant of Large Matrix

2007-06-06 Thread J. Robertson
James Stroud wrote: > Hello All, > > I'm using numpy to calculate determinants of matrices that look like > this (13x13): > > [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] [snip] > But I have a feeling I'm exceeding the capacity of floats here. Does > anyone have an idea for how to

Re: Determinant of Large Matrix

2007-06-06 Thread Dustan
On Jun 6, 6:47 am, Tommy Nordgren <[EMAIL PROTECTED]> wrote: > On 6 jun 2007, at 13.10, James Stroud wrote: > > > > > Hello All, > > > I'm using numpy to calculate determinants of matrices that look like > > this (13x13): > > > [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] > > [ 1.

Re: Determinant of Large Matrix

2007-06-06 Thread montyphyton
James Stroud je napisao/la: > Hello All, > > I'm using numpy to calculate determinants of matrices that look like > this (13x13): > > [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] > [ 1. 0. 1. 4. 1. 9. 4. 4. 1. 1. 4. 9. 4. 9.] > [ 1. 1. 0. 1. 4. 4. 9. 9. 4. 4

Re: Determinant of Large Matrix

2007-06-06 Thread Tommy Nordgren
On 6 jun 2007, at 13.10, James Stroud wrote: > Hello All, > > I'm using numpy to calculate determinants of matrices that look like > this (13x13): > > [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] > [ 1. 0. 1. 4. 1. 9. 4. 4. 1. 1. 4. 9. 4. 9.] > [ 1. 1. 0. 1. 4.

Determinant of Large Matrix

2007-06-06 Thread James Stroud
Hello All, I'm using numpy to calculate determinants of matrices that look like this (13x13): [[ 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.] [ 1. 0. 1. 4. 1. 9. 4. 4. 1. 1. 4. 9. 4. 9.] [ 1. 1. 0. 1. 4. 4. 9. 9. 4. 4. 1. 4. 1. 4.] [ 1. 4. 1. 0. 9.