numpy-discussion

[Numpy-discussion] Matrix/Vector norm?

[Norbert N. <Nor...@gm...>]

Hi there,

im missing a norm function in NumPy. Writing one by hand is simple, but
doing so both general and efficient is a lot more tricky.

Ideas?

Norbert

Re: [Numpy-discussion] Matrix/Vector norm?

[Travis O. <oli...@ie...>]

Norbert Nemec wrote:

>Hi there,
>
>im missing a norm function in NumPy. Writing one by hand is simple, but
>doing so both general and efficient is a lot more tricky.
>
>Ideas?
>  
>
There's one in scipy (i'm not sure if it's the best of breed, but it's a 
starting point).

Look in scipy.linalg.norm

-Travis

Re: [Numpy-discussion] Matrix/Vector norm?

[Norbert N. <Nor...@gm...>]

Travis Oliphant wrote:

> Norbert Nemec wrote:
>
>> Hi there,
>>
>> im missing a norm function in NumPy. Writing one by hand is simple, but
>> doing so both general and efficient is a lot more tricky.
>>
>> Ideas?
>>  
>>
> There's one in scipy (i'm not sure if it's the best of breed, but it's
> a starting point).
>
> Look in scipy.linalg.norm

Is there a reason not to have it in numpy.linalg? That would be the most
logical place for it, I would guess.

[Numpy-discussion] dtype=float32 not recognised.

[<ag...@no...>]

A curious problem (0.9.5.1993):

n [12]: theta3 =numpy.zeros(66,dtype=float32)
---------------------------------------------------------------------------
exceptions.NameError                                 Traceback (most recent call 
last)

/working/jrd/mod2/agn/OCCAM/AGN_GLOBAL/<ipython console> 

NameError: name 'float32' is not defined

But
n [14]: theta3 =numpy.zeros(66,dtype='f')

In [15]: theta3
Out[15]: 
array([ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
        0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
        0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
        0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
        0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.], 
dtype=float32)

George Nuresr


-----------------------------------------------------------------------
National Oceanography Centre, Southampton :: http://www.noc.soton.ac.uk

Re: [Numpy-discussion] dtype=float32 not recognised.

[Sasha <nd...@ma...>]

You did not import float32.

Your options:

>>> from numpy import *
>>> zeros(5, dtype=3Dfloat32)
array([ 0.,  0.,  0.,  0.,  0.], dtype=3Dfloat32)

or

>>> import numpy
>>> numpy.zeros(5, dtype=3Dnumpy.float32)
array([ 0.,  0.,  0.,  0.,  0.], dtype=3Dfloat32)

or

>>> import numpy
>>> numpy.zeros(5, dtype=3Dfloat)
array([ 0.,  0.,  0.,  0.,  0.])

-- sasha

On 1/24/06, ag...@no... <ag...@no...> wrote:
> A curious problem (0.9.5.1993):
>
> n [12]: theta3 =3Dnumpy.zeros(66,dtype=3Dfloat32)
> -------------------------------------------------------------------------=
--
> exceptions.NameError                                 Traceback (most rece=
nt call
> last)
>
> /working/jrd/mod2/agn/OCCAM/AGN_GLOBAL/<ipython console>
>
> NameError: name 'float32' is not defined
>
> But
> n [14]: theta3 =3Dnumpy.zeros(66,dtype=3D'f')
>
> In [15]: theta3
> Out[15]:
> array([ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
>         0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
>         0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
>         0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,
>         0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  =
0.],
> dtype=3Dfloat32)
>
> George Nuresr
>
>
> -----------------------------------------------------------------------
> National Oceanography Centre, Southampton :: http://www.noc.soton.ac.uk
>
>
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Re: [Numpy-discussion] dtype=float32 not recognised.

[Francesc A. <fa...@ca...>]

A Dimecres 25 Gener 2006 01:56, Sasha va escriure:
> You did not import float32.
>
> Your options:
> >>> from numpy import *
> >>> zeros(5, dtype=3Dfloat32)
>
> array([ 0.,  0.,  0.,  0.,  0.], dtype=3Dfloat32)
>
> or
>
> >>> import numpy
> >>> numpy.zeros(5, dtype=3Dnumpy.float32)
>
> array([ 0.,  0.,  0.,  0.,  0.], dtype=3Dfloat32)
>
> or
>
> >>> import numpy
> >>> numpy.zeros(5, dtype=3Dfloat)
>
> array([ 0.,  0.,  0.,  0.,  0.])

Another one:

>>> import numpy
>>> numpy.zeros(5, dtype=3D"float32")
array([ 0.,  0.,  0.,  0.,  0.], dtype=3Dfloat32)

=2D-=20
>0,0<   Francesc Altet =A0 =A0 http://www.carabos.com/
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