Re: [Visualpython-users] pylab

[Chris C. <scc...@gm...>]

On Sat, Nov 28, 2009 at 6:56 PM, Gary Pajer <gar...@gm...> wrote:
> PyLab is new to me, but I am familiar with pylab (matplotlib sub).  I also
> strongly suspect that matplotlib is what you want.  You don't say what
> platform you are on, but matplotlib is included in the Ubuntu installation
> repository.  I've found the easiest way to install matplotlib on WinXP is
> using the stand-alone installer on their website.   I think they offer an
> "easy_install" option, but I've gotten tied up in knots with that from time
> to time.
>
> Now, since Bruce brought it up ...
>
> One problem with "from pylab import *" is that matplotlib overwrites some
> numpy functions, for example linspace().   I don't know why or how that
> happened, but the two functions behave differently.  People probably expect
> the numpy behavior,   but unexpectedly get the matplotlib behavior.
>
> Perhaps PyLab does away with this conflict.  I don't know.
>
That is incorrect:

In [1]: import pylab as pl

In [2]: pl.linspace
Out[2]: <function linspace at 0x2763c80>

In [3]: import numpy as np

In [4]: np.linspace
Out[4]: <function linspace at 0x2763c80>

They are the same function.


>
>
> On Thu, Nov 19, 2009 at 4:10 PM, Bruce Sherwood <Bru...@nc...>
> wrote:
>>
>> After a bit of googling, the situation seems to be this:
>>
>> matplotlib (http://matplotlib.sourceforge.net) is a Python 2d plotting
>> library
>> which includes a module named pylab. I'm guessing that's what you're
>> looking for.
>>
>> A confusing factor is that at http://www.scipy.org/PyLab there is a
>> discussion
>> that starts out with this:
>>
>> See the following post for further discussion of the difference between
>> the
>> vision for a new PyLab expressed on this page, and the existing pylab
>> package
>> which is part of matplotlib:
>> http://www.nabble.com/pylab-td24910613.html
>>
>> Incidentally, the www.scipy.org/PyLab discussion makes a case for a new
>> pylab to
>> be invoked as "from pylab import *" which would import a bunch of stuff
>> almost
>> anyone doing scientific processing will need (including numpy and scipy),
>> rather
>> like the current situation with Visual. The essayist then says, foreseeing
>> objections, "But there are so many names! Not really. from scipy import *
>> brings
>> in about 20 subpackages (i.e. signal such that you still need to do
>> signal.ifft,
>> but not scipy.signal.ifft) and only 15 new symbols."
>>
>> Bruce Sherwood
>>
>> marco bittelli wrote:
>> > I am trying to install pylab for python 2.6, but I have problem finding
>> > the package (even in the main Python website).
>> >
>> >
>> >
>> > Could you help me ?
>> >
>> >
>> >
>> > Marco
>> >
>> >
>> >
>> > Marco Bittelli, Ph.D.
>> >
>> > Department of Agro-Environmental Science and Technology
>> >
>> > University of Bologna, Italy
>> >
>> > Viale Fanin, 44.
>> >
>> > 40125, Bologna, Italy
>> >
>> > email:mar...@un...
>> >
>> > http://www.dista.unibo.it/~bittelli
>>
>>
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