Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-27 Thread Robert Kern
On Tue, Jul 27, 2010 at 11:36, Skipper Seabold wrote: > On Tue, Jul 27, 2010 at 12:00 PM, Robert Kern wrote: >> On Tue, Jul 27, 2010 at 07:51, Skipper Seabold wrote: >>> On Mon, Jul 26, 2010 at 10:05 PM, Alan G Isaac wrote: But I am still confused about the use case. What is the scala

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-27 Thread Skipper Seabold
On Tue, Jul 27, 2010 at 12:00 PM, Robert Kern wrote: > On Tue, Jul 27, 2010 at 07:51, Skipper Seabold wrote: >> On Mon, Jul 26, 2010 at 10:05 PM, Alan G Isaac wrote: >>> But I am still confused about the use case. >>> What is the scalar- (or 1d-array-) returning procedure >>> invokedbefore takin

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-27 Thread Skipper Seabold
On Tue, Jul 27, 2010 at 10:01 AM, Alan G Isaac wrote: >> On Mon, Jul 26, 2010 at 10:05 PM, Alan G Isaac  wrote: >>> But I am still confused about the use case. >>> What is the scalar- (or 1d-array-) returning procedure >>> invoked before taking the determinant? > > > On 7/27/2010 8:51 AM, Skipper

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-27 Thread Robert Kern
On Tue, Jul 27, 2010 at 07:51, Skipper Seabold wrote: > On Mon, Jul 26, 2010 at 10:05 PM, Alan G Isaac wrote: >> But I am still confused about the use case. >> What is the scalar- (or 1d-array-) returning procedure >> invokedbefore taking the determinant? > > Recently I ran into this trying to ma

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-27 Thread Alan G Isaac
> On Mon, Jul 26, 2010 at 10:05 PM, Alan G Isaac wrote: >> But I am still confused about the use case. >> What is the scalar- (or 1d-array-) returning procedure >> invoked before taking the determinant? On 7/27/2010 8:51 AM, Skipper Seabold wrote: > Recently I ran into this trying to make the lo

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-27 Thread Skipper Seabold
On Mon, Jul 26, 2010 at 10:05 PM, Alan G Isaac wrote: > But I am still confused about the use case. > What is the scalar- (or 1d-array-) returning procedure > invokedbefore taking the determinant? > Recently I ran into this trying to make the log-likelihood of a multivariate and univariate autore

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Alan G Isaac
On 7/26/2010 8:18 PM, Skipper Seabold wrote: > np.linalg.det(np.array([[2]])) > #2.0 > > which should either fail or if not, then I think np.linalg.det should > handle scalars and scalars as 1d arrays It should not fail, because it follows from standard definitions. (E.g., it is the base case of a

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Joshua Holbrook
On Mon, Jul 26, 2010 at 4:51 PM, Alan G Isaac wrote: > On 7/26/2010 8:22 PM, Joshua Holbrook wrote: >> imo, the determinant of a scalar should be defined as itself, based on >> the definition of the determinant. > > What definition do you have in mind? > > Alan Isaac > > > > __

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Alan G Isaac
On 7/26/2010 8:22 PM, Joshua Holbrook wrote: > imo, the determinant of a scalar should be defined as itself, based on > the definition of the determinant. What definition do you have in mind? Alan Isaac ___ NumPy-Discussion mailing list NumPy-Discuss

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Charles R Harris
On Mon, Jul 26, 2010 at 6:22 PM, Joshua Holbrook wrote: > On Mon, Jul 26, 2010 at 4:18 PM, Skipper Seabold > wrote: > > On Mon, Jul 26, 2010 at 7:38 PM, Charles R Harris > > wrote: > >> > >> > >> On Mon, Jul 26, 2010 at 5:05 PM, Skipper Seabold > >> wrote: > >>> > >>> On Mon, Jul 26, 2010 at 5:

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Joshua Holbrook
On Mon, Jul 26, 2010 at 4:18 PM, Skipper Seabold wrote: > On Mon, Jul 26, 2010 at 7:38 PM, Charles R Harris > wrote: >> >> >> On Mon, Jul 26, 2010 at 5:05 PM, Skipper Seabold >> wrote: >>> >>> On Mon, Jul 26, 2010 at 5:48 PM, Alan G Isaac wrote: >>> > On 7/26/2010 12:45 PM, Skipper Seabold wrot

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Skipper Seabold
On Mon, Jul 26, 2010 at 7:38 PM, Charles R Harris wrote: > > > On Mon, Jul 26, 2010 at 5:05 PM, Skipper Seabold > wrote: >> >> On Mon, Jul 26, 2010 at 5:48 PM, Alan G Isaac wrote: >> > On 7/26/2010 12:45 PM, Skipper Seabold wrote: >> >> Right now np.linalg.det does not handle scalars or 1d (scal

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Charles R Harris
On Mon, Jul 26, 2010 at 5:05 PM, Skipper Seabold wrote: > On Mon, Jul 26, 2010 at 5:48 PM, Alan G Isaac wrote: > > On 7/26/2010 12:45 PM, Skipper Seabold wrote: > >> Right now np.linalg.det does not handle scalars or 1d (scalar) arrays. > > > > I don't have a real opinion on changing this, but I

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Skipper Seabold
On Mon, Jul 26, 2010 at 5:48 PM, Alan G Isaac wrote: > On 7/26/2010 12:45 PM, Skipper Seabold wrote: >> Right now np.linalg.det does not handle scalars or 1d (scalar) arrays. > > I don't have a real opinion on changing this, but I am curious > to know the use case, as the current behavior seems U

Re: [Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Alan G Isaac
On 7/26/2010 12:45 PM, Skipper Seabold wrote: > Right now np.linalg.det does not handle scalars or 1d (scalar) arrays. I don't have a real opinion on changing this, but I am curious to know the use case, as the current behavior seems a) correct and b) to provide an error check. Cheers, Alan

[Numpy-discussion] determinant of a scalar not handled

2010-07-26 Thread Skipper Seabold
Right now np.linalg.det does not handle scalars or 1d (scalar) arrays. It first tests that an array is 2d, then if it is square. This seems redundant to me. This currently works In [20]: np.linalg.det([[1]]) Out[20]: 1.0 but In [21]: np.linalg.det([1]) LinAlgError: 1-dimensional array given.