visualpython-users

[Visualpython-users] VP3-VP5, what's NewAxis ?

[Stef M. <s.m...@ru...>]

hello,

A number of VP3-scripts uses, like this

    r = pos-pos[:,NewAxis] # all pairs of atom-to-atom vectors
   

NewAxis isn't defined in VP5,
and I can't find any information about NewAxis.

Anyone has a clue ?

thanks,
Stef

Re: [Visualpython-users] VP3-VP5, what's NewAxis ?

[Bruce S. <Bru...@nc...>]

See the example programs stars.py or gas.py in the Visual 5 version, 
which have been rewritten to work either with Numeric (Visual 3) or 
numpy (Visual 5). I don't know why numpy made some seemingly trivial 
changes such as NewAxis -> newaxis. Annoying. But it was essential to 
invoke numpy rather than Numeric in Visual 5 because Numeric is no 
longer supported.

In the Visual 5 documentation (accessible from the IDLE help menu), 
choose "Numpy module (arrays)" for documentation on numpy.

Bruce Sherwood

Stef Mientki wrote:
> hello,
> 
> A number of VP3-scripts uses, like this
> 
>     r = pos-pos[:,NewAxis] # all pairs of atom-to-atom vectors
>    
> 
> NewAxis isn't defined in VP5,
> and I can't find any information about NewAxis.
> 
> Anyone has a clue ?
> 
> thanks,
> Stef
> 
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Re: [Visualpython-users] VP3-VP5, what's NewAxis ?

[Stef M. <s.m...@ru...>]

thanks Bruce,

Bruce Sherwood wrote:
> See the example programs stars.py or gas.py in the Visual 5 version, 
> which have been rewritten to work either with Numeric (Visual 3) or 
> numpy (Visual 5). I don't know why numpy made some seemingly trivial 
> changes such as NewAxis -> newaxis. Annoying.
I didn't notice the demo stars (as I've under the name Nebula_20), 
beautiful !
If it was only the newaxis, it can also be set with
try:
  NewAxis
except:
  NewAxis = newaxis
(Because I use a pre-script, it's easier for me to put it there once)
But there is also a subtle change with "tolist", I see :-(

Two minor remarks about the stars demo:

print """
Right button drag to rotate view.
Left button drag up or down to move in or out.
"""
shouldn't  "left button"  be "middle button" ?

and you misses at the end where " t += dt"
    Nsteps += 1

cheers,
Stef

Re: [Visualpython-users] VP3-VP5, what's NewAxis ?

[Bruce S. <Bru...@nc...>]

Thanks for the corrections, which I've checked into CVS.

Bruce Sherwood

Stef Mientki wrote:
> thanks Bruce,
> 
> Bruce Sherwood wrote:
>> See the example programs stars.py or gas.py in the Visual 5 version, 
>> which have been rewritten to work either with Numeric (Visual 3) or 
>> numpy (Visual 5). I don't know why numpy made some seemingly trivial 
>> changes such as NewAxis -> newaxis. Annoying.
> I didn't notice the demo stars (as I've under the name Nebula_20), 
> beautiful !
> If it was only the newaxis, it can also be set with
> try:
>   NewAxis
> except:
>   NewAxis = newaxis
> (Because I use a pre-script, it's easier for me to put it there once)
> But there is also a subtle change with "tolist", I see :-(
> 
> Two minor remarks about the stars demo:
> 
> print """
> Right button drag to rotate view.
> Left button drag up or down to move in or out.
> """
> shouldn't  "left button"  be "middle button" ?
> 
> and you misses at the end where " t += dt"
>     Nsteps += 1
> 
> cheers,
> Stef
> 
> 
> ------------------------------------------------------------------------------
> Check out the new SourceForge.net Marketplace.
> It is the best place to buy or sell services for
> just about anything Open Source.
> http://p.sf.net/sfu/Xq1LFB
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

Re: [Visualpython-users] VP3-VP5, what's NewAxis ?

[Guy K. K. <g....@ma...>]

On Fri, 09 Jan 2009 09:42:51 Bruce Sherwood wrote:
> I don't know why numpy made some seemingly trivial
> changes such as NewAxis -> newaxis. Annoying.

I'd guess they did it as it's more PEP-8 compatible. NewAxis looks like a 
class, whereas newaxis is an attribute, variable, or some other identifier. 
numpy.newaxis is comparable to visual.color.magenta in a way.

I'm glad that it's renamed, as it is not possible to create a NewAxis 
instance, and therefore is much less confusing to the Python programmer.

Guy

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Re: [Visualpython-users] VP3-VP5, what's NewAxis ?

[Bruce S. <Bru...@nc...>]

Interesting points. Thanks for the insight.

Bruce Sherwood

Guy K. Kloss wrote:
> On Fri, 09 Jan 2009 09:42:51 Bruce Sherwood wrote:
>> I don't know why numpy made some seemingly trivial
>> changes such as NewAxis -> newaxis. Annoying.
> 
> I'd guess they did it as it's more PEP-8 compatible. NewAxis looks like a 
> class, whereas newaxis is an attribute, variable, or some other identifier. 
> numpy.newaxis is comparable to visual.color.magenta in a way.
> 
> I'm glad that it's renamed, as it is not possible to create a NewAxis 
> instance, and therefore is much less confusing to the Python programmer.
> 
> Guy
>