matplotlib-users Mailing List for matplotlib

On 4/15/12 10:12 AM, Jae-Joon Lee wrote:
> Unfortunately, this is something that I haven't considered when
> implementing the FancyArrowPatch.
> As you may know, FancyArrowPatch is a single patch object (at least
> viewed from outside), so you cannot have multiple linestyles that can
> be set by users.
>
> So, one option is to change the implementation to use a hard-coded
> line style for arrow heads, but this is not straight forward in fact.

That was my conclusion as well.  Thanks for confirming.

>
> Another option is to use custom path effects. Attached is a modified
> version of your script with this approach.
> Although this makes your code more complicated, this could be the most
> straight forward way.

Awesome.  I've submitted a patch to Sage with your example (and credited 
you as an author): http://trac.sagemath.org/sage_trac/ticket/12852

Thanks,

Jason

Hi folks,

A number of you expressed interest in attending the PyData workshop
last month and unfortunately we had very tight space restrictions.
But thanks to the team at Marakana, who pitched in and were willing to
film, edit and post videos for many of the talks, you can access them
all here:

http://marakana.com/s/2012_pydata_workshop,1090/index.html

They are in 720p so you can actually read the terminals, though I
think you have to click the YouTube link to be able to change the
resolution.

Enjoy!

f

On Tue, Apr 17, 2012 at 3:16 AM, Sameer Grover <sam...@gm...>wrote:

>  On Tuesday 17 April 2012 12:36 PM, Abhishek Pratap wrote:
>
> Hi Guys
>
> I am starting to render plots with matplotlib as I learn both python and
> this interesting plotting library. I need help with a custom plot for a
> problem I am working on. May be there is an inbuilt function already.
>
> Problem:
> I am trying to draw a table(rectangle) as a plot with 96 individual cells
> ( 8 rows X 12 cols). Color each alternative cell with a specific color (
> like a chess board : instead of black I will use some other color) and
> insert value for each cell from a pandas data frame or python dictionary.
> Show the col and row labels on the side.
>
> Sample Data:   http://pastebin.com/N4A7gWuH
>
> Appreciate your input.
>
> Thanks!
> -Abhi
>
>
> ------------------------------------------------------------------------------
> Better than sec? Nothing is better than sec when it comes to
> monitoring Big Data applications. Try Boundary one-second
> resolution app monitoring today. Free.http://p.sf.net/sfu/Boundary-dev2dev
>
>
>
> _______________________________________________
> Matplotlib-users mailing lis...@li...://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>  I think you'll need to use the function imshow with interpolation set to
> None.
> Sameer
>
>
Actually, interpolation set to 'none', not the Python None.  Here is some
code:

a = np.zeros((8 * 12, 3))
a[::2, 0] = 1.0     # red
a[1::2, 2] = 0.75  # blue
a.shape = (8, 12, 3)

plt.imshow(a, interpolation='none')
plt.show()

Note that there is currently a bug in plt.imsave() that makes saving this
throw an exception (but you can still save using fig.savefig()).

Cheers!
Ben Root

On 16 April 2012 23:36, Damon McDougall <D.M...@wa...> wrote:

> On Monday, 16 April 2012 at 16:34, Kacper Kowalik wrote:
>
>
> On 16 Apr 2012 22:31, "Damon McDougall" <D.M...@wa...> wrote:
> >
> > Hi Kacper,
> >
> > Just to be clear, is it tri.Triangulation(x, y) that hangs, or is it
> plt.tricontour(…)?
>
> It's plt.tricontour that hangs, tri.Triangulation properly issues warning
> about duplicates.
> Cheers,
> Kacper
>
> > On Monday, 16 April 2012 at 14:28, Kacper Kowalik wrote:
>
> >>
> >> Hi,
> >> I haven't been able to pin point it exactly but following script:
> >>
> >> import matplotlib.pyplot as plt
> >> import matplotlib.tri as tri
> >> import numpy as np
> >> from numpy.random import uniform, seed
> >>
> >> seed(0)
> >> npts = 200
> >> x = uniform(-2,2,npts)
> >> y = uniform(-2,2,npts)
> >> z = x*np.exp(-x**2-y**2)
> >>
> >> y[1:3] = x[0] # 4 or more duplicate points make tricontour hang!!!
> >> x[1:3] = y[0]
>
> You should call z = x*np.exp(-x**2-y**2) _before_ changing the points
> you're triangulating.
> Having said that, I see the same behaviour even if I change the vertices
> before I compute z.
>
> >> triang = tri.Triangulation(x, y)
> >> plt.tricontour(x, y, z, 15, linewidths=0.5, colors='k')
> >>
> >> plt.show()
> >>
> >>
> >> causes infinite loop in _tri.so. It happens in matplotlib-1.1.0 as well
> >> as git HEAD.
> >> I understand that my input is not exactly valid, but I'd rather see MPL
> >> die than occupy my box for eternity ;)
> >> Best regards,
> >> Kacper
>
> I think the reason it's hanging is because you're trying to plot the
> contours of a function that is defined on an invalid triangulation (edges
> cross at points that are not in the vertex set). I think the best way to
> deal with this is to write a helper function to check the triangulation is
> valid. If it isn't, either tri.Triangulation(x, y) should fail, or the
> plotter should fail.
>
> Anybody else have any suggestions?
>

We can definitely do better here.  I have created a issue request on github:
https://github.com/matplotlib/matplotlib/issues/838
and will investigate further.

Ian

On Tuesday 17 April 2012 12:36 PM, Abhishek Pratap wrote:
> Hi Guys
>
> I am starting to render plots with matplotlib as I learn both python 
> and this interesting plotting library. I need help with a custom plot 
> for a problem I am working on. May be there is an inbuilt function 
> already.
>
> Problem:
> I am trying to draw a table(rectangle) as a plot with 96 individual 
> cells ( 8 rows X 12 cols). Color each alternative cell with a specific 
> color ( like a chess board : instead of black I will use some other 
> color) and insert value for each cell from a pandas data frame or 
> python dictionary. Show the col and row labels on the side.
>
> Sample Data: http://pastebin.com/N4A7gWuH
>
> Appreciate your input.
>
> Thanks!
> -Abhi
>
>
> ------------------------------------------------------------------------------
> Better than sec? Nothing is better than sec when it comes to
> monitoring Big Data applications. Try Boundary one-second
> resolution app monitoring today. Free.
> http://p.sf.net/sfu/Boundary-dev2dev
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
I think you'll need to use the function imshow with interpolation set to 
None.
Sameer

Hi Guys

I am starting to render plots with matplotlib as I learn both python and
this interesting plotting library. I need help with a custom plot for a
problem I am working on. May be there is an inbuilt function already.

Problem:
I am trying to draw a table(rectangle) as a plot with 96 individual cells (
8 rows X 12 cols). Color each alternative cell with a specific color ( like
a chess board : instead of black I will use some other color) and insert
value for each cell from a pandas data frame or python dictionary. Show the
col and row labels on the side.

Sample Data:   http://pastebin.com/N4A7gWuH

Appreciate your input.

Thanks!
-Abhi

Thanks, Mike, everything primed looks nice again.

Best wishes,
Alex


On 17/04/12 7:53 AM, Michael Droettboom wrote:
> This bug was introduced in PR #54.  That tried to fix the behavior of 
> the apostrophe character, but inadvertently made primes smaller as 
> well.  The fix is revert prime to its old size, but make the 
> apostrophe equivalent to "^\prime".
>
> Are you able to test the following pull request and ensure that it 
> resolves your issues?
>
> https://github.com/matplotlib/matplotlib/pull/836
>
> Mike
>
> On 04/16/2012 10:13 AM, Alexander Wagner wrote:
>> ps. my math-related rcParams are just the defaults, i think
>>
>> mathtext.cal : cursive
>> mathtext.rm  : serif
>> mathtext.tt  : monospace
>> mathtext.it  : serif:italic
>> mathtext.bf  : serif:bold
>> mathtext.sf  : sans
>> mathtext.fontset : cm
>> mathtext.fallback_to_cm : True
>> mathtext.default : it
>>
>>
>> On 16/04/12 10:50 PM, Michael Droettboom wrote:
>>> What is the math string you are using?  I can't seem to reproduce 
>>> this with:
>>>
>>>    "$D_{40}\prime\prime$"
>>>
>>> What are your math-related rcParams?
>>>
>>> Mike
>>>
>>> On 04/15/2012 08:53 PM, Alexander Wagner wrote:
>>>> Dear Matplotlib users,
>>>>
>>>> Mathtext primed used to be rendered correctly in 1.0.0 like so
>>>>
>>>>
>>>>
>>>> But now they look tiny and badly spaced in 1.1.0 like so
>>>>
>>>>
>>>>
>>>> I haven't tried with all fonts, but it is the case with Bitstream 
>>>> Vera Sans and Helvetica. Can anyone confirm?
>>>>
>>>> If I use the LaTeX renderer, it looks correct.
>>>>
>>>> Many thanks,
>>>> Alex
>>>>
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
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>>>> Boundary is the first to Know...and Tell You.
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>>>>
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>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> For Developers, A Lot Can Happen In A Second.
>>> Boundary is the first to Know...and Tell You.
>>> Monitor Your Applications in Ultra-Fine Resolution. Try it FREE!
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>>>
>>>
>>> _______________________________________________
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>>
>>
>>
>> ------------------------------------------------------------------------------
>> For Developers, A Lot Can Happen In A Second.
>> Boundary is the first to Know...and Tell You.
>> Monitor Your Applications in Ultra-Fine Resolution. Try it FREE!
>> http://p.sf.net/sfu/Boundary-d2dvs2
>>
>>
>> _______________________________________________
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>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
> ------------------------------------------------------------------------------
> For Developers, A Lot Can Happen In A Second.
> Boundary is the first to Know...and Tell You.
> Monitor Your Applications in Ultra-Fine Resolution. Try it FREE!
> http://p.sf.net/sfu/Boundary-d2dvs2
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users