[Matplotlib-users] Best way to display image from URL in Python3

2015-03-19 Thread Ryan Nelson
Hello all,

I'm porting over some code that used Py2.7 urllib2.urlopen(url) to grab
some image data from the net and load with pyplot.imread. It doesn't work
quite right in Py3.4. I found a couple of refs:

https://github.com/matplotlib/matplotlib/pull/1650
http://stackoverflow.com/questions/15183170/python-crash-when-downloading-image-as-numpy-array

They suggest io.BytesIO(urllib.request.urlopen(url).read()) as a
replacement for Py3. Is this the best practice? Does anyone know a simpler
way to do this?

Ryan
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Re: [Matplotlib-users] segmentation fault when saving images

2015-03-19 Thread Benjamin Root
well, that still doesn't explain the segfaults. NaNs shouldn't cause
matplotlib to crash upon saving. I would still be interested in a
stacktrace.

Ben

On Thu, Mar 19, 2015 at 1:27 PM, Gabriele Brambilla <
gb.gabrielebrambi...@gmail.com> wrote:

> Actually Paul Hobson was right.
>
> Now it works.
>
> Thanks
>
> Gabriele
>
> On Thu, Mar 19, 2015 at 1:19 PM, Benjamin Root  wrote:
>
>> The warnings probably have nothing to do with the issue at hand. Try
>> this. Install the package "faulthandler" and add the appropriate lines to
>> your Bdipoly.py script and run it again. That way, we can get a traceback
>> and find out where it is segfaulting from.
>>
>> http://faulthandler.readthedocs.org/en/latest/
>>
>> Ben Root
>>
>> As a side-note: faulthandler is part of the standard library as of 3.3!
>> Neat!
>>
>>
>> On Thu, Mar 19, 2015 at 1:13 PM, Gabriele Brambilla <
>> gb.gabrielebrambi...@gmail.com> wrote:
>>
>>> Hi guys,
>>>
>>> I don't understand why now, after I save an image when it is prompted
>>> out, the image is not saved and it closes automatically and on the terminal
>>> appears segmentation fault.
>>>
>>> this is what my terminal shows:
>>>
>>> [gs66-stumbras:~/Desktop] gbrambil% python Bdipole.py
>>>
>>> Bdipole.py:52: RuntimeWarning: divide by zero encountered in divide
>>>
>>>   lwb = 5/(np.log10(modB.max()/modB))
>>>
>>> Bdipole.py:55: RuntimeWarning: divide by zero encountered in divide
>>>
>>>   lwe = 5/(np.log10(modE.max()/modE))
>>>
>>> Segmentation fault
>>>
>>>
>>> Thanks
>>>
>>>
>>> Gabriele
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Dive into the World of Parallel Programming The Go Parallel Website,
>>> sponsored
>>> by Intel and developed in partnership with Slashdot Media, is your hub
>>> for all
>>> things parallel software development, from weekly thought leadership
>>> blogs to
>>> news, videos, case studies, tutorials and more. Take a look and join the
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>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>>
>>>
>>
>
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[Matplotlib-users] ANN: HoloViews 1.0 released

2015-03-19 Thread Jean-Luc Stevens
We are pleased to announce the first public release of HoloViews, a
Python package for scientific and engineering data visualization:

http://ioam.github.io/holoviews

HoloViews provides composable, sliceable, declarative data structures
for building even complex visualizations easily.

It's designed to exploit the rich ecosystem of scientific Python tools
already available, using Numpy for data storage, matplotlib and mpld3
as plotting backends, and integrating fully with IPython Notebook to
make your data instantly visible.

If you look at the website for just about any other visualization
package, you'll see a long list of pretty pictures, each one of which
has a page or two of code putting it together.  There are pretty
pictures in HoloViews too, but there is *no* hidden code -- *all* of
the steps needed to build a given figure are shown right before the
HoloViews plot, with just a few lines needed for nearly all of our
examples, even complex multi-figure subplots and animations.  This
concise but flexible specification makes it practical to explore and
analyze your data interactively, while leaving a full record for later
reproducibility in the notebook.

It may sound like magic, but it's not -- HoloViews simply lets you
annotate your data with appropriate metadata, and then the data can
display itself!  HoloViews provides a set of general, compositional,
multidimensional data structures suitable for both discrete and
continuous real-world data, and pairs them with separate customizable
plotting classes to visualize them without extensive coding.  A
large collection of continuously tested IPython Notebook tutorials
accompanies HoloViews, showing you precisely the small number of steps
required to generate any of the plots.

Some of the most important features:

- Freely available under a BSD license
- Python 2 and 3 compatible
- Minimal external dependencies -- easy to integrate into your workflow
- Builds figures by slicing, sampling, and composing your data
- Builds web-embeddable animations without any extra coding
- Easily customizable without obscuring the underlying data objects
- Includes interfaces to pandas and Seaborn
- Winner of the 2015 UK Open Source Award

For the rest, check out ioam.github.io/holoviews!

Jean-Luc Stevens
Philipp Rudiger
James A. Bednar

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


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Re: [Matplotlib-users] segmentation fault when saving images

2015-03-19 Thread Gabriele Brambilla
Actually Paul Hobson was right.

Now it works.

Thanks

Gabriele

On Thu, Mar 19, 2015 at 1:19 PM, Benjamin Root  wrote:

> The warnings probably have nothing to do with the issue at hand. Try this.
> Install the package "faulthandler" and add the appropriate lines to your
> Bdipoly.py script and run it again. That way, we can get a traceback and
> find out where it is segfaulting from.
>
> http://faulthandler.readthedocs.org/en/latest/
>
> Ben Root
>
> As a side-note: faulthandler is part of the standard library as of 3.3!
> Neat!
>
>
> On Thu, Mar 19, 2015 at 1:13 PM, Gabriele Brambilla <
> gb.gabrielebrambi...@gmail.com> wrote:
>
>> Hi guys,
>>
>> I don't understand why now, after I save an image when it is prompted
>> out, the image is not saved and it closes automatically and on the terminal
>> appears segmentation fault.
>>
>> this is what my terminal shows:
>>
>> [gs66-stumbras:~/Desktop] gbrambil% python Bdipole.py
>>
>> Bdipole.py:52: RuntimeWarning: divide by zero encountered in divide
>>
>>   lwb = 5/(np.log10(modB.max()/modB))
>>
>> Bdipole.py:55: RuntimeWarning: divide by zero encountered in divide
>>
>>   lwe = 5/(np.log10(modE.max()/modE))
>>
>> Segmentation fault
>>
>>
>> Thanks
>>
>>
>> Gabriele
>>
>>
>>
>>
>>
>> --
>> Dive into the World of Parallel Programming The Go Parallel Website,
>> sponsored
>> by Intel and developed in partnership with Slashdot Media, is your hub
>> for all
>> things parallel software development, from weekly thought leadership
>> blogs to
>> news, videos, case studies, tutorials and more. Take a look and join the
>> conversation now. http://goparallel.sourceforge.net/
>> ___
>> Matplotlib-users mailing list
>> Matplotlib-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>>
>
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Re: [Matplotlib-users] segmentation fault when saving images

2015-03-19 Thread Benjamin Root
The warnings probably have nothing to do with the issue at hand. Try this.
Install the package "faulthandler" and add the appropriate lines to your
Bdipoly.py script and run it again. That way, we can get a traceback and
find out where it is segfaulting from.

http://faulthandler.readthedocs.org/en/latest/

Ben Root

As a side-note: faulthandler is part of the standard library as of 3.3!
Neat!


On Thu, Mar 19, 2015 at 1:13 PM, Gabriele Brambilla <
gb.gabrielebrambi...@gmail.com> wrote:

> Hi guys,
>
> I don't understand why now, after I save an image when it is prompted out,
> the image is not saved and it closes automatically and on the terminal
> appears segmentation fault.
>
> this is what my terminal shows:
>
> [gs66-stumbras:~/Desktop] gbrambil% python Bdipole.py
>
> Bdipole.py:52: RuntimeWarning: divide by zero encountered in divide
>
>   lwb = 5/(np.log10(modB.max()/modB))
>
> Bdipole.py:55: RuntimeWarning: divide by zero encountered in divide
>
>   lwe = 5/(np.log10(modE.max()/modE))
>
> Segmentation fault
>
>
> Thanks
>
>
> Gabriele
>
>
>
>
>
> --
> Dive into the World of Parallel Programming The Go Parallel Website,
> sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for
> all
> things parallel software development, from weekly thought leadership blogs
> to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now. http://goparallel.sourceforge.net/
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>
>
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Re: [Matplotlib-users] segmentation fault when saving images

2015-03-19 Thread Paul Hobson
What happens when you edit your program to avoid dividing by zero?

-p



—
Sent from Mailbox

On Thu, Mar 19, 2015 at 10:14 AM, Gabriele Brambilla
 wrote:

> Hi guys,
> I don't understand why now, after I save an image when it is prompted out,
> the image is not saved and it closes automatically and on the terminal
> appears segmentation fault.
> this is what my terminal shows:
> [gs66-stumbras:~/Desktop] gbrambil% python Bdipole.py
> Bdipole.py:52: RuntimeWarning: divide by zero encountered in divide
>   lwb = 5/(np.log10(modB.max()/modB))
> Bdipole.py:55: RuntimeWarning: divide by zero encountered in divide
>   lwe = 5/(np.log10(modE.max()/modE))
> Segmentation fault
> Thanks
> Gabriele--
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[Matplotlib-users] segmentation fault when saving images

2015-03-19 Thread Gabriele Brambilla
Hi guys,

I don't understand why now, after I save an image when it is prompted out,
the image is not saved and it closes automatically and on the terminal
appears segmentation fault.

this is what my terminal shows:

[gs66-stumbras:~/Desktop] gbrambil% python Bdipole.py

Bdipole.py:52: RuntimeWarning: divide by zero encountered in divide

  lwb = 5/(np.log10(modB.max()/modB))

Bdipole.py:55: RuntimeWarning: divide by zero encountered in divide

  lwe = 5/(np.log10(modE.max()/modE))

Segmentation fault


Thanks


Gabriele
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