matplotlib-users Mailing List for matplotlib (Page 14)

> 2. I have a skymap I would like to plot using a particular projection
> - what I've been doing so far is specifying x and y coordinates using
> mgrid and calling contourf(x,y,data,100) to approximate this. But
> what I'd rather do is something like
> imshow(data,extent=[-pi,pi,-pi/2,pi/2]) ... when I call that with a
> projection axis activated, the projection isn't honored - the image
> just appears as a regular square box. Is there any way to get imshow
> to respect the projection?
>
Did you try pcolormesh (or pcolor)? I believe these commands respect
the projection.
 pcolormesh(x, y, data)
-JJ

I've been playing with some of the projections in matplotlib,
recently, and have some questions/noticed some odd behavior:
1. Is there any way to activate a projection mode with the pyplot
interface other than the subplot(111,projection='whatever') method a
la /examples/api/custom_projection_example.py ? Along these same
lines, is the projection feature documented in greater detail
somewhere? About everything I've figured out has come from
custom_projection_example.py ...
2. I have a skymap I would like to plot using a particular projection
- what I've been doing so far is specifying x and y coordinates using
mgrid and calling contourf(x,y,data,100) to approximate this. But
what I'd rather do is something like
imshow(data,extent=[-pi,pi,-pi/2,pi/2]) ... when I call that with a
projection axis activated, the projection isn't honored - the image
just appears as a regular square box. Is there any way to get imshow
to respect the projection?

I'm using 0.98.3 as well... I get a dictionary too. Should have
backed up another step and checked that, I just iterated over the
return and got the keys. Thanks for the help.
On Thu, Sep 4, 2008 at 2:25 PM, Ryan May <rm...@gm...> wrote:
> Eric Wertman wrote:
>>
>> Hi Everyone.. the docs for boxplot say :
>>
>> Returns a list of the :class:`matplotlib.lines.Line2D` instances added.
>>
>> It seems to be returning a list of strings rather than a list of
>> handles... What's the easiest way for me to get the handles of those
>> objects, with only the names? It's giving me this:
>>
>> medians <type 'str'>
>> fliers <type 'str'>
>> whiskers <type 'str'>
>> boxes <type 'str'>
>> caps <type 'str'>
>
> I get a dictionary with medians, flier, whiskers, boxes, and caps as keys
> and lists of Line2D objects as the values. What version are you running?
> I'm on 0.98.3 here.
>
> Either way the docstring is wrong.
>
> Ryan
>
> --
> Ryan May
> Graduate Research Assistant
> School of Meteorology
> University of Oklahoma
>

Eric Wertman wrote:
> Hi Everyone.. the docs for boxplot say :
> 
> Returns a list of the :class:`matplotlib.lines.Line2D` instances added.
> 
> It seems to be returning a list of strings rather than a list of
> handles... What's the easiest way for me to get the handles of those
> objects, with only the names? It's giving me this:
> 
> medians <type 'str'>
> fliers <type 'str'>
> whiskers <type 'str'>
> boxes <type 'str'>
> caps <type 'str'>
I get a dictionary with medians, flier, whiskers, boxes, and caps as 
keys and lists of Line2D objects as the values. What version are you 
running? I'm on 0.98.3 here.
Either way the docstring is wrong.
Ryan
-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

Hi Everyone.. the docs for boxplot say :
Returns a list of the :class:`matplotlib.lines.Line2D` instances added.
It seems to be returning a list of strings rather than a list of
handles... What's the easiest way for me to get the handles of those
objects, with only the names? It's giving me this:
medians <type 'str'>
fliers <type 'str'>
whiskers <type 'str'>
boxes <type 'str'>
caps <type 'str'>
Thanks!
Eric

Thanks,
Worked perfectly.
Mathieu Leplatre-2 wrote:
> 
> On Wed, Aug 27, 2008 at 11:14 AM, stuartornum <st...@mu...>
> wrote:
>>
>> Hi,
>>
>> I would like to be able to plot dates along the X axis' with values up
>> the
>> Y. However Im having problems with the correct format in order to pass to
>> plot_date().
>>
>> This is what I have so far: (example)
>>
>> ####################################
>> List = [ [datetime.datetime(2008, 7, 12, 5, 12)], ['46.8'] ]
>>
>> plot_date(List[0], List[1])
>> #####################################
>> Returns error:
>>
>> c = numeric.array(data, dtype=tc, copy=True, order=order)
>> ValueError: setting an array element with a sequence.
>> #####################################
>>
>> I have looked at the pylab example for plot_date, however it uses a
>> drange()
>> to figure out the dates and doesn't show me how to do it one by one.
>>
> 
> Hi
> 
> Have a look at pylab.date2num()
> 
> Mathieu.
> 
> 
> 
>> Thank you for your time.
>> --
>> View this message in context:
>> http://www.nabble.com/plot_date%28%29---Correct-format-to-plot-tp19181899p19181899.html
>> Sent from the matplotlib - users mailing list archive at Nabble.com.
>>
>>
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-- 
View this message in context: http://www.nabble.com/plot_date%28%29---Correct-format-to-plot-tp19181899p19306302.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

I'm always glad to see that old chestnut resurface, but it doesn't 
really address the need for a hole in the middle. (I'm sure the 
dolphins are very happy about that...)
matplotlib paths use the "non-zero" filling rule, so the directionality 
of the path affects filling. The best concise description I know of is 
here:
http://www.w3.org/TR/SVG/painting.html#FillProperties
So the direction of the inside and outside paths must be different in 
order to create donut-like shapes.
I've added donut_demo.py to the examples (add attached it here).
Hope that helps.
Cheers,
Mike
Alan G Isaac wrote:
> Paul Novak wrote:
> 
>> Are there any more examples of matplotlib's new path functionality, in 
>> addition to the one in examples/api/path_patch_demo.py?
>> 
>
> http://www.mail-archive.com/mat...@li.../msg07706.html
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
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> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 
-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Paul Novak wrote:
> Are there any more examples of matplotlib's new path functionality, in 
> addition to the one in examples/api/path_patch_demo.py?
http://www.mail-archive.com/mat...@li.../msg07706.html

On Wed, Sep 3, 2008 at 4:25 AM, Fredrik Johansson
<fre...@gm...> wrote:
> Removing the call to ylim is not an acceptable solution, because this
> is just a part (the problematic part) of the data I am trying to plot
> (most of which fits within the ylimits). The problem also persists
> when zooming out.
Although I did not see the problem when I tried your example (I just
have a field of white inside the axes and not the "large filled
boxes", this does sound from your description like a bug we have seen
before, where polygon artifacts are introduced by zooming too far into
a figure. I'm pretty sure is a consequence of our creating a canvas
size in agg that overflows the max integer canvas size, because on a
big zoom we create the full figure canvas and then clip what is
outside the viewport. This is the same reason people report
exponential slowing down on repeated zooms. Both of these are the
same bu that needs to be fixed.
JDH

On Wed, Sep 3, 2008 at 6:37 AM, Tony S Yu <to...@mi...> wrote:
> I may be missing something here, but everything plots fine *if you remove
> the call to ylim*. Note that the minimum y value is 194.213. I wouldn't
> expect to see anything if none of the data is between y = -40 .. 40. Sorry
> if I'm overlooking something.
>
> Best,
> -Tony
Removing the call to ylim is not an acceptable solution, because this
is just a part (the problematic part) of the data I am trying to plot
(most of which fits within the ylimits). The problem also persists
when zooming out.
Fredrik

On Wednesday, 3 September 2008, dmitrey wrote:
> hi all,
> matplotlib says it's similar to MATLAB's plot tool, however, using
> plot(..., 'p') plots pentagram instead of star. It makes my (Python
> scikits.openopt) graphic output of numerical convergence look
> uglier than MATLAB version.
>
> So is plotting a star intended to be ever implemented?
> Thank you in advance, Dmitrey
Use scatter instead of plot where you can custom-define a marker with 
an arbitrary number of sides in polygon, star or asterisk format. 
E.g. to get a hexagonal star use:
scatter(xvalues,yvalues,marker=(6,1,0)
See also scatter docstring.
Johann

hi all,
matplotlib says it's similar to MATLAB's plot tool, however, using 
plot(..., 'p') plots pentagram instead of star. It makes my (Python 
scikits.openopt) graphic output of numerical convergence look uglier 
than MATLAB version.
So is plotting a star intended to be ever implemented?
Thank you in advance, Dmitrey

Hi All matplotlib users,
I want to ask a question about figure dimension (pixels), how to set the
figure's dimension that we will create using matlotlib.pyplot.savefig() ?
Thank You ..
-- 
Zainal Abidin, S.Si
Sub Bidang Informasi Meteorologi Publik
Badan Meteorologi dan Geofisika
Jl. Angkasa I No. 2
Jakarta - Indonesia
*Visit Indonesia Year 2008 - Celebrating 100 Years of National Awakening*

On Sep 2, 2008, at 6:56 PM, Fredrik Johansson wrote:
> Hi,
>
> I've encountered what appears to be a bug in matplotlib-0.98.3
> (Windows XP, Python 2.5). The following plot of a function with poles
> displays garbage (large filled boxes instead of a curve). There's
> large variation in the y values, but not so large that this shouldn't
> be possible to plot correctly.
>
> Is this problem known? Is there a workaround?
>
> from pylab import *
> x = [-2.97, -2.94, -2.91, -2.88, -2.85, -2.82, -2.79, -2.76, -2.73, 
> -2.7,
> -2.67, -2.64, -2.61, -2.58, -2.55, -2.52, -2.49, -2.46, -2.43, -2.4, 
> -2.37,
> -2.34, -2.31, -2.28, -2.25, -2.22, -2.19, -2.16, -2.13, -2.1, -2.07, 
> -2.04,
> -2.01, -1.98, -1.95, -1.92, -1.89, -1.86, -1.83, -1.8, -1.77, -1.74, 
> -1.71,
> -1.68, -1.65, -1.62, -1.59, -1.56, -1.53, -1.5, -1.47, -1.44, -1.41, 
> -1.38,
> -1.35, -1.32, -1.29,-1.26, -1.23, -1.2, -1.17, -1.14, -1.11, -1.08, 
> -1.05,
> -1.02, -0.99, -0.96, -0.93, -0.9, -0.87, -0.84, -0.81, -0.78, -0.75, 
> -0.72,
> -0.69, -0.66, -0.63, -0.6, -0.57, -0.54, -0.51, -0.48, -0.45, -0.42, 
> -0.39,
> -0.36, -0.33, -0.3, -0.27, -0.24, -0.21, -0.18, -0.15, -0.12, -0.09, 
> -0.06,
> -0.03]
> y = [7.40742e+6, 462976.0, 91463.4, 28950.0, 11867.8, 5732.96, 
> 3104.37,
> 1830.03, 1153.53, 768.963, 538.805, 395.968, 305.58, 248.666, 214.668,
> 197.843, 195.517, 207.33, 235.138, 283.525, 361.162, 483.641, 679.315,
> 1001.79, 1558.46, 2581.22, 4621.92, 9171.58, 21022.7, 60014.1, 
> 249909.0,
> 2.34376e+6, 6.0e+8, 3.75e+7, 960013.0, 146498.0, 40995.2, 
> 15633.9,7200.57,
> 3768.46, 2164.71, 1336.34, 875.104, 603.287, 436.34, 331.148, 264.559,
> 223.743, 201.613, 194.594, 201.594, 223.706, 264.503, 331.072, 
> 436.244,
> 603.172, 874.968, 1336.19, 2164.53, 3768.26, 7200.35, 15633.7, 
> 40994.9,
> 146498.0, 960013.0, 3.75e+7, 6.0e+8, 2.34376e+6, 249909.0, 60013.7,
> 21022.2, 9171.01, 4621.3, 2580.56, 1557.75, 1001.03, 678.491, 482.753,
> 360.205, 282.492, 234.022, 206.125, 194.213, 196.431, 213.137, 
> 247.004,
> 303.774, 394.002, 536.66, 766.62, 1150.97, 1827.22, 3101.28, 5729.56,
> 11864.0, 28945.8, 91458.8, 462971.0, 7.40741e+6]
> plot(x, y)
> ylim([-40, 40])
> show()
I may be missing something here, but everything plots fine *if you 
remove the call to ylim*. Note that the minimum y value is 194.213. I 
wouldn't expect to see anything if none of the data is between y = 
-40 .. 40. Sorry if I'm overlooking something.
Best,
-Tony
> --
> Fredrik
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's 
> challenge
> Build the coolest Linux based applications with Moblin SDK & win 
> great prizes
> Grand prize is a trip for two to an Open Source event anywhere in 
> the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Hi,
I've encountered what appears to be a bug in matplotlib-0.98.3
(Windows XP, Python 2.5). The following plot of a function with poles
displays garbage (large filled boxes instead of a curve). There's
large variation in the y values, but not so large that this shouldn't
be possible to plot correctly.
Is this problem known? Is there a workaround?
from pylab import *
x = [-2.97, -2.94, -2.91, -2.88, -2.85, -2.82, -2.79, -2.76, -2.73, -2.7,
-2.67, -2.64, -2.61, -2.58, -2.55, -2.52, -2.49, -2.46, -2.43, -2.4, -2.37,
-2.34, -2.31, -2.28, -2.25, -2.22, -2.19, -2.16, -2.13, -2.1, -2.07, -2.04,
-2.01, -1.98, -1.95, -1.92, -1.89, -1.86, -1.83, -1.8, -1.77, -1.74, -1.71,
-1.68, -1.65, -1.62, -1.59, -1.56, -1.53, -1.5, -1.47, -1.44, -1.41, -1.38,
-1.35, -1.32, -1.29,-1.26, -1.23, -1.2, -1.17, -1.14, -1.11, -1.08, -1.05,
-1.02, -0.99, -0.96, -0.93, -0.9, -0.87, -0.84, -0.81, -0.78, -0.75, -0.72,
-0.69, -0.66, -0.63, -0.6, -0.57, -0.54, -0.51, -0.48, -0.45, -0.42, -0.39,
-0.36, -0.33, -0.3, -0.27, -0.24, -0.21, -0.18, -0.15, -0.12, -0.09, -0.06,
-0.03]
y = [7.40742e+6, 462976.0, 91463.4, 28950.0, 11867.8, 5732.96, 3104.37,
1830.03, 1153.53, 768.963, 538.805, 395.968, 305.58, 248.666, 214.668,
197.843, 195.517, 207.33, 235.138, 283.525, 361.162, 483.641, 679.315,
1001.79, 1558.46, 2581.22, 4621.92, 9171.58, 21022.7, 60014.1, 249909.0,
2.34376e+6, 6.0e+8, 3.75e+7, 960013.0, 146498.0, 40995.2, 15633.9,7200.57,
3768.46, 2164.71, 1336.34, 875.104, 603.287, 436.34, 331.148, 264.559,
223.743, 201.613, 194.594, 201.594, 223.706, 264.503, 331.072, 436.244,
603.172, 874.968, 1336.19, 2164.53, 3768.26, 7200.35, 15633.7, 40994.9,
146498.0, 960013.0, 3.75e+7, 6.0e+8, 2.34376e+6, 249909.0, 60013.7,
21022.2, 9171.01, 4621.3, 2580.56, 1557.75, 1001.03, 678.491, 482.753,
360.205, 282.492, 234.022, 206.125, 194.213, 196.431, 213.137, 247.004,
303.774, 394.002, 536.66, 766.62, 1150.97, 1827.22, 3101.28, 5729.56,
11864.0, 28945.8, 91458.8, 462971.0, 7.40741e+6]
plot(x, y)
ylim([-40, 40])
show()
--
Fredrik

Hi,
What is the best way to get the pixels values in addition to the pixel 
numbers when moving the mouse on on imhow display?
It could be either on the fly (would be great) or on click.
"best way" here means that the code can be quite complex but that it 
should be as simple as imshow from the end user point of view.
I'm using TkAgg.
Xavier

Are there any more examples of matplotlib's new path functionality, in 
addition to the one in examples/api/path_patch_demo.py? Specifically, I 
would like an example of using compound paths to draw a donut-shape that 
shows the inner and outer edge and fills the donut with a color.
Thank you,
Paul

On Tue, Sep 2, 2008 at 5:04 AM, bernardo martins rocha
<ber...@me...> wrote:
> Hi Guys,
>
> I have some questions:
>
> 1. How can I zoom in the horizontal axis and maintain the vertical axis
> unchanged with the zoom tool provided by matplotlib?
Hold down the 'x' key while zooming to constrain the zoom to the
x-axis -- ditto for 'y'. This is covered at
http://matplotlib.sourceforge.net/doc/html/users/navigation_toolbar.html
> 2. How can I change the xticks so that they do not overlap each other?
> For instance, I have a plot in time, but since it's a huge simulation
> the time ticks 2000 3000 are overlapping, so that I cannot understand.
> Is it possible to change the units? Like 2 3 and then add 10^3 somewhere
> else? I hope you can understand my question...sorry if it's not clear.
You can set fewer ticks either by using your own date locator instance
(see the user's guide' chapter on tick locating and formatting) or by
setting the tick locations explicitly (eg, ax.set_xticks).
Another thing that can help is to rotate the tick labels -- with date
plots there is a helper function
 fig.autofmt_xdate()
which does this automatically. The basic code is
for label in ax.get_xticklabels():
 label.set_horizontalalignment('right')
 label.set_rotation(30)
JDH

Hi Guys,
I have some questions:
1. How can I zoom in the horizontal axis and maintain the vertical axis 
unchanged with the zoom tool provided by matplotlib?
2. How can I change the xticks so that they do not overlap each other? 
For instance, I have a plot in time, but since it's a huge simulation 
the time ticks 2000 3000 are overlapping, so that I cannot understand. 
Is it possible to change the units? Like 2 3 and then add 10^3 somewhere 
else? I hope you can understand my question...sorry if it's not clear.
Bernardo M. Rocha

On Mon, Sep 1, 2008 at 4:37 AM, Lotfi Benz <lb...@go...> wrote:
> I am using matplotlib since three months, every thing was fine untill today
> I have got this error message which is strange and I could not figure out
> what it means.
> here I paste the error message I got.
> """
> Another agent is running...
> Failed to allocate the agent. Exitting...
> Failed to invoking the agent: No such file or directory
> Cannot launch the agent
> The messenger is now down
This looks like a KDE/Qt problem, not a matplotlib problem, eg
googling for the phrase,
 Failed to invoking the agent: No such file or directory
turns up hits like this:
 https://bugs.launchpad.net/ubuntu/+source/scim-bridge/+bug/203334
JDH

I am using matplotlib since three months, every thing was fine untill today
I have got this error message which is strange and I could not figure out
what it means.
here I paste the error message I got.
"""
Another agent is running...
Failed to allocate the agent. Exitting...
Failed to invoking the agent: No such file or directory
Cannot launch the agent
The messenger is now down
"""
Does somebody knows where it comes from and how to cure it?
Thanks in advance
Lotfi