matplotlib-users Mailing List for matplotlib (Page 2)

I took my example from the matplotlib pages itself:

http://matplotlib.org/examples/api/fahrenheit_celcius_scales.html

If you know a better way, please show me.

P.

On 9/24/12 4:40 PM, Benjamin Root wrote:
>
>
> On Mon, Sep 24, 2012 at 12:21 AM, Paul Tremblay 
> <pau...@gm... <mailto:pau...@gm...>> wrote:
>
>     Here is my example of a Pareto chart.
>
>     For an explanation of a Pareto chart:
>
>     http://en.wikipedia.org/wiki/Pareto_chart
>
>     Could I get this chart added to the matplolib gallery?
>
>
>     Thanks
>
>     Paul
>
>
> Your code looks overly complicated.  You shouldn't have to be doing 
> the connection to the ylim_changed event, I don't think.  I think your 
> main problem is that you are calling ax1.plot instead of ax2.plot.
>
> I am not against adding more examples to the gallery, but this would 
> have to be cleaned up before it gets included.
>
> Ben Root
>

On 9/24/2012 3:32 PM, David Honcik wrote:
> I've run into a large memory leak using Matplotlib with PySide and the
> Qt4 back end.  I'm using :
> Python 3.2
> Numpy 1.6.2
> Pyside 1.1.1 (qt474)
> Matplotlib 1.2 (first the Capetown Group port to Python 3, then 1.2 RC2)
> on Windows XP 32 bit
> I've tried using the Python 2.7 branch of all of the above and don't see
> the problem.  I don't see the problem with the Tk back end.  I don't see
> the problem with the Qt4 back end and PyQt4.  Only with the above
> mentioned versions and using the Qt4 back end with PySide.
> The following script will reproduce the problem :
> --------------------
> import matplotlib
> matplotlib.use('Qt4Agg')
> matplotlib.rcParams['backend.qt4']='PySide'
> import pylab
> arrayX = []
> arrayY = []
> for nIndex in range(0, 100):
> arrayX.append(nIndex)
> arrayY.append(nIndex)
> Figure = matplotlib.pyplot.figure(1)
> Axes = Figure.add_axes([ 0.05, 0.05, 0.95, 0.95])
> Axes.plot(arrayX,
> arrayY,
> color      = "blue",
> marker     = "o",
>            markersize = 5.0)
> Axes.set_xlim(arrayX[0], arrayX[len(arrayX) - 1])
> Axes.set_ylim(arrayY[0], arrayY[len(arrayY) - 1])
> matplotlib.pyplot.show()
> --------------------
> I run the above, grab the lower right sizing handle on the plot window
> and start resizing the window.  Watching the python process in task
> manager, each resize leaks a noticeable amount of memory.  A few minutes
> of this will get process memory up to ~2.5 GB. At that point it crashes.
> I'm new here, am I in the right place?
>

I can reproduce this exactly, also with pyside 1.1.2 and an empty plot. 
Looks like QtGui.QImage is leaking.

import matplotlib
matplotlib.use('Qt4Agg')
matplotlib.rcParams['backend.qt4']='PySide'
from matplotlib import pyplot
pyplot.plot()
pyplot.show()

--
Christoph

Hi Ben,

Benjamin Root wrote:
> 
> 
> On Monday, September 24, 2012, Martin Mokrejs wrote:
> 
>     Hi,
>       I have pie charts with relatively long texts assigned to each slice of the pie.
>     The text is drawn horizontally. Instead, I would like to have it rotated at the
>     same angle as the slice itself (i.e. centered at the "axis" of the slice). In this
>     way the text would not overlap other text of adjacent slices (or at least if the
>     text starts far enough from the pie).
> 
>     The example below is a bit over-twisted but I really want to be able to read at
>     least a portion of those ['my text4', 'my text5', 'my text6', 'my text7'] legends.
> 
>  
> Hmmm, this might be a decent feature to add to pie().  Although, I wonder if a legend would better suit your needs?

The problem is that some of my pie charts have dozens of slices or very varying width.
The legend would take just too much space and moreover, there is not that many colors
easily distinguishable by eye so a person would have a hard time to find which item in
the legend corresponds to some slice in the chart.

I think this is the only way out. ;-)

Martin
BTW: A percentage in black color on a blue slice is hardly readable. Could pie() also
change a font foreground color if the background is too dark in those few slices? Say
to white? ;-))

On Monday, September 24, 2012, Martin Mokrejs wrote:

> Hi,
>   I have pie charts with relatively long texts assigned to each slice of
> the pie.
> The text is drawn horizontally. Instead, I would like to have it rotated
> at the
> same angle as the slice itself (i.e. centered at the "axis" of the slice).
> In this
> way the text would not overlap other text of adjacent slices (or at least
> if the
> text starts far enough from the pie).
>
> The example below is a bit over-twisted but I really want to be able to
> read at
> least a portion of those ['my text4', 'my text5', 'my text6', 'my text7']
> legends.
>
>
Hmmm, this might be a decent feature to add to pie().  Although, I wonder
if a legend would better suit your needs?

Ben Root