matplotlib-users Mailing List for matplotlib

>>>>> "Engelsma," == Engelsma, Dave <D.E...@La...> writes:

    Engelsma,> Why are the x-axis limits adjusted when I try to plot a
    Engelsma,> vertical line as a Control Limit?

Everytime you add some data to the plot, matplotlib recomputes the
axis limits.  The quick fix for you is to set your xlim after all the
plot commands

    # the histogram of the data
    n, bins, patches = matplotlib.matlab.hist(histogram_data, 10, normed=0)
    # add a 'best fit' line
    y = matplotlib.matlab.normpdf(bins, average[i], std_dev[i])
    l = matplotlib.matlab.plot(bins, y, 'r--')
    matplotlib.matlab.set(l, 'linewidth', 2)
    matplotlib.matlab.xlabel(DataDescription[i])
    matplotlib.matlab.ylabel('Number of Parts')
    matplotlib.matlab.plot([201,201],[0,40],'k--')
    matplotlib.matlab.title(PartNum + " -- " + PartDesc)
    matplotlib.matlab.set(matplotlib.matlab.gca(), 'xlim', [199, 205])
    matplotlib.matlab.show()

But it's not clear to me why the autoset would leave some of your data
offscreen - that shouldn't happen.  I'll take a look at that code.  Is
it possible for you to provide a complete example that replicates the
problem?

On an unrelated note, give that you like to use the fully qualified
names of all the functions, you might prefer the object oriented
interface

    n, bins, patches = matplotlib.matlab.hist(histogram_data, 10, normed=0)
    ax = matplotlib.matlab.subplot(111)
    y = matplotlib.mlab.normpdf(bins, average[i], std_dev[i])
                    ^ normpdf is defined in mlab.py, not matlab.py

    lines = ax.plot(bins, y, 'r--')
    for line in lines:
        line.set_linewidth(2)
    ax.set_xlabel(DataDescription[i])
    ax.set_ylabel('Number of Parts')
    ax.plot([201,201],[0,40],'k--')
    ax.set_title(PartNum + " -- " + PartDesc)

    ax.set_xlim([199, 205])

    matplotlib.matlab.show()

Hope this helps,
John Hunter

Hi -

I'm using the following code to generate a histogram. I also want to plot
the Upper Control Limit as a vertical line to the right of the histogram
bars and a Lower Control Limit to the left of the bars. Each Control Limit
would be represented by a vertical line. The code below does not include the
line necessary to plot a sample control limit.

# the histogram of the data
n, bins, patches = matplotlib.matlab.hist(histogram_data, 10, normed=0)
# add a 'best fit' line
y = matplotlib.matlab.normpdf(bins, average[i], std_dev[i])
l = matplotlib.matlab.plot(bins, y, 'r--')
matplotlib.matlab.set(l, 'linewidth', 2)
matplotlib.matlab.set(matplotlib.matlab.gca(), 'xlim', [199, 205])
matplotlib.matlab.xlabel(DataDescription[i])
matplotlib.matlab.ylabel('Number of Parts')
matplotlib.matlab.title(PartNum + " -- " + PartDesc)
matplotlib.matlab.show()

When I modify the code with the additional line to plot a Lower Control
Limit: 

# the histogram of the data
n, bins, patches = matplotlib.matlab.hist(histogram_data, 10, normed=0)
# add a 'best fit' line
y = matplotlib.matlab.normpdf(bins, average[i], std_dev[i])
l = matplotlib.matlab.plot(bins, y, 'r--')
matplotlib.matlab.set(l, 'linewidth', 2)
matplotlib.matlab.set(matplotlib.matlab.gca(), 'xlim', [199, 205])
matplotlib.matlab.xlabel(DataDescription[i])
matplotlib.matlab.ylabel('Number of Parts')
matplotlib.matlab.plot([201,201],[0,40],'k--')	<--- added this line to plot
a control limit
matplotlib.matlab.title(PartNum + " -- " + PartDesc)
matplotlib.matlab.show()

The x-axis limits are somehow automatically forced to something less than
that specified in the line: matplotlib.matlab.set(matplotlib.matlab.gca(),
'xlim', [199, 205]). The histogram appears as would be expected, but now I
cannot see my Control Limit (specified in the added line of code) as it
seems to be plotted off of the chart.

If I comment out the additional line (that plotted a vertical line as a
control limit), the x-axis limits return to normal, as expected (199 ->
205).

Why are the x-axis limits adjusted when I try to plot a vertical line as a
Control Limit?

Thanks in advance,

Dave Engelsma

>>>>> "Jean-Baptiste" == Jean-Baptiste Cazier <jea...@de...> writes:

    Jean-Baptiste> Hi !  The more I look at matplotlib, the more nice
    Jean-Baptiste> feature I find.  However there are more that I
    Jean-Baptiste> haven't found yet, eventhough they might be
    Jean-Baptiste> implemented. I would like to have a little more
    Jean-Baptiste> interactivity with the plot itself. By this I do
    Jean-Baptiste> not mean the interactivity with the python shell,
    Jean-Baptiste> but with the mouse: - Double click on the
    Jean-Baptiste> legend/axes/label allow it modification - Single
    Jean-Baptiste> Click on a drawn line give the properties of the
    Jean-Baptiste> function and/or location - In short, being able to
    Jean-Baptiste> treat elements of the figure as widgets - I reckon
    Jean-Baptiste> the whole figure is a DrawingArea and that might
    Jean-Baptiste> not be straight forward

    Jean-Baptiste> Of course just having a signal sent with the
    Jean-Baptiste> propoerties of the curves would be good enough

    Jean-Baptiste> Are more people interested in that ?

It's not something I need in my own work, but I think it would be a
good addition to matplotlib and I'd be happy to include it.  To that
end, I wrote some demo code to get you started!  I implemented an
object picker (currently only for tick labels and lines but this can
easily be extended to include the other elements of the figure).

I also wrote the start of a line properties dialog.  It should be
straight forward to extend to incorporate the other line properties,
(markeredgecolor, etc...) and then to do the same for a text
properties dialog, etc....

I needed to add a few things to matplotlib to make this easier, so
you'll need to grab the snapshot at 

  http://nitace.bsd.uchicago.edu:8080/files/share/matplotlib-0.42a.tar.gz

and see the file examples/object_picker.py.  

Good luck!
John Hunter

>>>>> "John" == John Hunter <jdh...@ac...> writes:

    John> Your paths to the GTK runtime library are not set properly.
    John> Check out

Alternatively, you should be able to use the WX backend with the
enthought edition of python with no extra installation.  Just

    import matplotlib
    matplotlib.use('WX')
    from matplotlib.matlab import plot, show
    plot([1,2,3])
    show()

Good luck,
John Hunter

>>>>> "David" == David Nordquest <Nor...@ga...> writes:

    David> I've just installed Matplotlib with the 2.3 version of
    David> Python packaged by Enthought & believe I followed the
    David> instructions on the Matplotlib web page.  I am getting the
    David> following error message:

Hi David,

Your paths to the GTK runtime library are not set properly.  Check out

  http://matplotlib.sourceforge.net/installing.html

and the following pygtk FAQ entry addresses the PATH issue at length

  http://www.async.com.br/faq/pygtk/index.py?req=show&file=faq21.012.htp

Should cure what ails you,
John Hunter

Hi !

The more I look at matplotlib, the more nice feature I find.
However there are more that I haven't found yet, eventhough they might
be implemented. I would like to have a little more interactivity with
the plot itself. By this I do not mean the interactivity with the python
shell, but with the mouse:
- Double click on the legend/axes/label allow it modification
- Single Click on a drawn line give the properties of the function=20
and/or location
- In short, being able to treat elements of the figure as widgets
- I reckon the whole figure is a DrawingArea and that might not be
straight forward

Of course just having a signal sent with the propoerties of the curves
would  be good enough

Are more people interested in that ?

Takk

Kve=C3=B0ja

Jean-Baptiste

Dave, 

Are you sure you installed pygtk as mentioned at
http://matplotlib.sourceforge.net/backends.html ?
You might print out your sys.path to verify.

--Randy

> -----Original Message-----
> From: mat...@li... [mailto:matplotlib-
> use...@li...] On Behalf Of David Nordquest
> Sent: Wednesday, January 21, 2004 9:48 PM
> To: mat...@li...
> Subject: [Matplotlib-users] Gobject missing
> 
> I've just installed Matplotlib with the 2.3 version of Python packaged
> by Enthought & believe I followed the instructions on the Matplotlib
web
> page.  I am getting the following error message:
> 
> IDLE 1.0
>  >>> from matplotlib.matlab import *
> 
> Traceback (most recent call last):
>    File "<pyshell#0>", line 1, in -toplevel-
>      from matplotlib.matlab import *
>    File "D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\matlab.py",
> line 121, in -toplevel-
>      from axes import Subplot, Axes
>    File "D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\axes.py",
> line 119, in -toplevel-
>      import backends
>    File
>
"D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\backends\__init__.py"
,
> line 9, in -toplevel-
>      from backend_gtk import AxisText, Figure, FigureManager, \
>    File
> "D:\PROGRA~1\PYTHON23\Lib\site-
> packages\matplotlib\backends\backend_gtk.py",
> line 13, in -toplevel-
>      import gobject
> ImportError: DLL load failed: One of the library files needed to run
> this application cannot be found.
>  >>>
> 
> I'd be grateful for any suggestions.
> 
> Dave
> 
> 
> 
> 
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> 

I've just installed Matplotlib with the 2.3 version of Python packaged 
by Enthought & believe I followed the instructions on the Matplotlib web 
page.  I am getting the following error message:

IDLE 1.0
 >>> from matplotlib.matlab import *

Traceback (most recent call last):
   File "<pyshell#0>", line 1, in -toplevel-
     from matplotlib.matlab import *
   File "D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\matlab.py", 
line 121, in -toplevel-
     from axes import Subplot, Axes
   File "D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\axes.py", 
line 119, in -toplevel-
     import backends
   File 
"D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\backends\__init__.py", 
line 9, in -toplevel-
     from backend_gtk import AxisText, Figure, FigureManager, \
   File 
"D:\PROGRA~1\PYTHON23\Lib\site-packages\matplotlib\backends\backend_gtk.py", 
line 13, in -toplevel-
     import gobject
ImportError: DLL load failed: One of the library files needed to run 
this application cannot be found.
 >>>

I'd be grateful for any suggestions.

Dave