matplotlib-users Mailing List for matplotlib

On Wed, Nov 30, 2011 at 7:43 PM, Benjamin Root <ben...@ou...> wrote:
> As an additional note, would it be a desirable feature to be able to cycle
> hash styles in the case of producing b&w plots?
>
> Ben Root

Ben,

I think this would be quite useful. How are you thinking of
implementing it? Cycling through
lines = ['-', '--', '-.', etc] or through dashes = [(20,10), (5,5),
(30,7), etc]?

-paul

On Sat, Dec 10, 2011 at 10:36 AM, Alex Naysmith <yeo...@gm...>wrote:

> Hello,
>
> I'm trying to plot the stresses in colour of a strained isoparametric
> element.
>
> I have a six noded triangle with vertice coordinates
> [(xa1,ya1),(xa2,ya2),(xa3,ya3)] = pos_a
>
> This triangle deforms and the new coordinate positions are
> [(xb1,yb1),(xa2,yb2),(xb3,yb3)] = pos_b
>
> The remaining nodes are mid nodes also with rest and deformed coordinate
> positions.
>
> To plot the edges of the triangle I use a Jacobian transformation function
> so that the coordinates of the triangle are in Jacobian coordinates xi1 and
> xi2 (with xi3 = 1 - xi1 - xi2). This is required as the elements are
> quadratic with mid-nodes.
>
> Each interval is hard coded so that:
> xi1 = [1.0,0.9,0.8,0.7,0.6,0.5, etc..]
> xi2 = [0.0,0.1,0.2,0.3,0.4,0.5, etc..]
>
> I would like to plot the strains in colour so that the interior of the
> triangle is filled but I don't want to hard code the Jacobian intervals as
> this seems an awkward way of doing it.
>
> With strain as a function of xi1 and xi2, How can matplotlib provide a
> continuous interior strain plot of the triangle for all the xi1 and xi2
> values from 0 to 1?
>
> Regards
>
> Alex Naysmith
>
>
Alex,

Perhaps if you can provide an example figure, we might be able to better
help you.  Right now, I am having trouble envisioning what you describe.

Ben Root

Hey Fabien,

So you made your principal function run on a timer every 2 seconds?  And 
by "lag" do you mean that the GUI is unresponsive?  I'm still not seeing 
when the loop stops, but what you can do is set the timer at a 0 
interval so it will call the principal function as fast as it can (but 
with no loop).  The problem with this is that you have those 2 sleep 
calls in the function.  I'm not sure why you have the sleeps, but if you 
need them you have two choices:

1. Make you GUI multi-threaded and you could emit a Qt signal from the 
data thread when the GUI thread needs to update the GUI.  Yes this could 
get complicated, but if the sleeps are required then its probably the 
best way.

2. (From what I've been told, the Qt experts don't approve this) You can 
use app.processEvents() in your loop (after each sleep maybe) and this 
will pause your function and tell the main event loop to process any 
queued events (like GUI actions/events) which will make your GUI more 
responsive.

If that doesn't make sense let me know.

-Dave

On 12/12/11 9:16 AM, Fabien Lafont wrote:
> Hi David! Sorry about the delay I was abroad and without any way to
> connect to the internet.
>
> Thank you very much. I've tried to put the principal inside the
> timerEvent. It work but it lags. In fact I've set the interval of the
> Timer to 2 seconds because the principal loop takes roughly 2seconds
> but it's not very accurate...
>
> Is there a way to do the principal loop, show it on the screen, then
> redo the loop?
>
> Thanks again!
>
> Fabien
>
> 2011/12/5 David Hoese<dh...@gm...>:
>> If I'm understanding your question correctly and reading your code correctly, you're asking why the timer method of doing things works, but the principal() while loop method does not.
>>
>> I had a couple solutions that involved the main event loop, but I just noticed 2 main things that are probably wrong with your code:
>> 1. You are calling 'principal' from inside __init__ so you never actually return from __init__ which means that you never call "window.show()" and therefore never call "qApp.exec_()".  If you really want to use the 'principal' method you would have to connect it to a one shot timer anyway to have it run after you have started the application ('qApp.exec_()').  I think the recommended way would be to use the timer the way you did in your latest email.
>>
>> 2. At least in the way my email client reads your original code, your calls to the matplotlib drawing functions aren't inside the while loop and the while loop never ends...although this doesn't matter if you don't fix #1 above.
>>
>> Hope that made sense.
>>
>> -Dave
>>
>>
>> On 12/5/11 1:44 PM, mat...@li... wrote:
>>> Message: 3
>>> Date: Mon, 5 Dec 2011 15:46:02 +0100
>>> From: Fabien Lafont<laf...@gm...>
>>> Subject: Re: [Matplotlib-users] [ploting data] Live data
>>> Cc:mat...@li...
>>> Message-ID:
>>>        <CAC...@ma...>
>>> Content-Type: text/plain; charset=ISO-8859-1
>>>
>>> Thx all for your remarks,
>>>
>>> I can't understand why this code works (when I use the timer method):
>>
>> ------------------------------------------------------------------------------
>> All the data continuously generated in your IT infrastructure
>> contains a definitive record of customers, application performance,
>> security threats, fraudulent activity, and more. Splunk takes this
>> data and makes sense of it. IT sense. And common sense.
>> http://p.sf.net/sfu/splunk-novd2d
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

On Fri, Dec 9, 2011 at 8:45 PM, Aycha Tammour <ata...@uw...> wrote:

> Hello,
>
> I am trying to make a figure with a text that includes H$\beta$ but for
> some reason matplotlib would freeze. I cannot understand what's wrong with
> $\beta$. I tried other Greek letters and some of them worked but not all.
>
> Any suggestions?
>
> Cheers,
> Aycha
>
>
Aycha,

Which version of matplotlib are you using and on which OS?

Ben Root

Hi David! Sorry about the delay I was abroad and without any way to
connect to the internet.

Thank you very much. I've tried to put the principal inside the
timerEvent. It work but it lags. In fact I've set the interval of the
Timer to 2 seconds because the principal loop takes roughly 2seconds
but it's not very accurate...

Is there a way to do the principal loop, show it on the screen, then
redo the loop?

Thanks again!

Fabien

2011/12/5 David Hoese <dh...@gm...>:
> If I'm understanding your question correctly and reading your code correctly, you're asking why the timer method of doing things works, but the principal() while loop method does not.
>
> I had a couple solutions that involved the main event loop, but I just noticed 2 main things that are probably wrong with your code:
> 1. You are calling 'principal' from inside __init__ so you never actually return from __init__ which means that you never call "window.show()" and therefore never call "qApp.exec_()".  If you really want to use the 'principal' method you would have to connect it to a one shot timer anyway to have it run after you have started the application ('qApp.exec_()').  I think the recommended way would be to use the timer the way you did in your latest email.
>
> 2. At least in the way my email client reads your original code, your calls to the matplotlib drawing functions aren't inside the while loop and the while loop never ends...although this doesn't matter if you don't fix #1 above.
>
> Hope that made sense.
>
> -Dave
>
>
> On 12/5/11 1:44 PM, mat...@li... wrote:
>> Message: 3
>> Date: Mon, 5 Dec 2011 15:46:02 +0100
>> From: Fabien Lafont<laf...@gm...>
>> Subject: Re: [Matplotlib-users] [ploting data] Live data
>> Cc:mat...@li...
>> Message-ID:
>>       <CAC...@ma...>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> Thx all for your remarks,
>>
>> I can't understand why this code works (when I use the timer method):
>
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users