matplotlib-users Mailing List for matplotlib

On Tue, Jun 5, 2012 at 10:18 AM, Eric Firing <ef...@ha...> wrote:
> In oceanography: it is used in the shipboard ADCP data acquisition and
> processing systems, presently installed on 20 ships.
Suggestion: let's have for mpl something like what we created long ago
for IPython, an official page listing projects that use it (and btw,
if your project uses IPython as a component/library and you're not
already listed here, please do so!):
http://wiki.ipython.org/Projects_using_IPython
While I'm not a huge fan of wikis for everything, for this it's
actually a good solution, as it's very low overhead for others to
update. And it comes in handy as an official list whenever we do
presentations about IPython, to show that it's actually useful for
something.
I don't think we have a MPL wiki, but if it's just for a page or two
we could just use the one at github.
Cheers,
f

I got pretty good results with the code below. Note that I am reading the
FLIP_COLORS from a gui checkbox.
 FLIP_COLORS = self.dark_background_flag.get()
 if FLIP_COLORS:
 matplotlib.rcParams['figure.facecolor'] = '0.0'
 matplotlib.rcParams['axes.edgecolor'] = 'grey'
 matplotlib.rcParams['text.color'] = 'white'
 matplotlib.rcParams['ytick.color'] = '#00ff00'
 matplotlib.rcParams['xtick.color'] = '#0ED5D5'
 matplotlib.rcParams['axes.labelcolor'] = '#0ED5D5'
 matplotlib.rcParams['axes.facecolor'] = 'black'
 matplotlib.rcParams['grid.color'] = '0.3'
 matplotlib.rcParams['grid.linestyle'] = '-'
 matplotlib.rcParams['lines.markeredgewidth'] = 0.0
 else:
 matplotlib.rcdefaults()
 ## I seems like setting matplotlib.rcParams['figure.facecolor']
isn't
 ## enough. I think this is a bug and set_facecolor() is a
work-around.
 fig.set_facecolor(matplotlib.rcParams['figure.facecolor'])
This will flip and also flip back. I found a few colors didn't follow
the crowd. For example, axes.ylabel.color doesn't seem to have
an entry in rcParams. For this, I have to modify the plot generation
statments something like:
 ax.set_ylabel('Voltage (volts)',
color=matplotlib.rcParams['ytick.color'])
That sets the ylabel text to be the same as the tick marks. I also have to
do things like that to change line colors and such when
going flipping colors.
DavidS

Thanks Eric. This is quite an informative answer about colormap! 
The first part of the answer is exactly what I need. 
cheers,
Chao
efiring wrote:
> 
> On 06/02/2012 03:37 AM, Chao YUE wrote:
>> Dear all,
>>
>> I find I would like to make some change from the existing colormaps. for
>> example, I would like to change the color at the beginning of the
>> colormap (let's say mat.cm.jet) but I still
>> want to use the remaining other colors. So is there way I can easily use
>> some functions already in matplotlib to extract the colorlist and levels
>> from a mat.cm.jet?
>> Then I can just change the first color of the colorlist, and use
>> mat.colors.LinearSegmentedColormap.from_list to easily construct the
>> colormap I want.
> 
> Try playing with something like this (in ipython --pylab):
> 
> jetcmap = cm.get_cmap("jet", 10) #generate a jet map with 10 values
> jet_vals = jetcmap(np.arange(10)) #extract those values as an array
> jet_vals[0] = [0.1, 0, 0.1, 1] #change the first value
> newcmap = mpl.colors.LinearSegmentedColormap.from_list("newjet", jet_vals)
> imshow(rand(18,20), cmap=newcmap, vmin=0, vmax=1, interpolation="nearest")
> colorbar()
> 
> Alternatively, you can copy the cm.datad['jet'] dictionary (datad is a 
> dictionary of dictionaries), modify it, and use it to initialize a 
> custom LinearSegmentedColormap instance. See 
> http://matplotlib.sourceforge.net/examples/pylab_examples/custom_cmap.html.
> 
> 
>>
>> I can use mat.cm.jet._segmentdata to retrieve the dictionary. I also
>> have a look at the source code
> 
> In general it is not a good idea to work with attributes with leading 
> underscores, which flag them as especially low-level 
> implementation-dependent details. cm.jet._segmentdata can be accessed as 
> cm.datad['jet'].
> 
> Note also that the _segmentdata is not what is used directly to look up 
> the colors; instead it is used to generate the lookup table (_lut 
> attribute). See below.
> 
>> /usr/local/lib/python2.7/dist-packages/matplotlib/colors.py but I didn't
>> manage to find a solution.
>>
>> both mat.colors.LinearSegmentedColormap and mat.colors.ListedColormap
>> finally calls mat.colors.Colormap.__init__ and then I don't understand
>> how these colorlist are really used for plotting.
>>
> 
> Typically it is a two-stage process. First, a data array is passed to a 
> Normalize instance which scales it to the range from zero to one. 
> Second, that scaled array is passed to the Colormap instance, which uses 
> its lookup table to map any point in the 0-1 range to a color.
> 
> Less commonly, instead of passing an array of floats to the Colormap 
> instance, one may pass in an integer array, in which case these integers 
> are used directly as indices into the lookup table (which is the _lut 
> attribute of the Colormap instance.)
> 
>> Another question, where can I find the source code where mat.cm.jet is
>> defined?
> 
> Good question; the answer is obscured by somewhat convoluted coding in 
> cm.py. The relevant part is this:
> 
> for cmapname in datad.iterkeys():
> cmap_d[cmapname] = _generate_cmap(cmapname, LUTSIZE)
> 
> locals().update(cmap_d)
> 
> 
> The first block is filling a dictionary with LinearSegmentedColormap 
> instances corresponding to the named sets of segment data from _cm.py.
> The "locals" line is the tricky part: it is adding each entry in that 
> dictionary to the local namespace, so that cm.cmap_d["jet"] can be 
> accessed as cm.jet, etc.
> 
> There is a bit more to it, because Colormap instances can handle three 
> special values: over range, under range, and "bad" (masked). See 
> http://matplotlib.sourceforge.net/examples/pylab_examples/contourf_demo.html
> and
> http://matplotlib.sourceforge.net/examples/pylab_examples/image_masked.html
> 
> Eric
> 
> 
>>
>> thanks et cheers,
>>
>> Chao
> 
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and 
> threat landscape has changed and how IT managers can respond. Discussions 
> will include endpoint security, mobile security and the latest in malware 
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 
> 
-- 
View this message in context: http://old.nabble.com/get-colorlist-and-values-from-existing-matplotlib-colormaps--tp33949604p33965531.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

On 06/03/2012 01:41 PM, Kevin Hunter wrote:
> Hullo List,
>
> I've just spent 20 minutes of searching with various terms and no luck
> finding even one answer: What open source projects use matplotlib?
>
> I'm especially interested in open source /science/ projects that use
> matplotlib.
>
> I got excited when I saw scienceoss.com, but I still could not find a
> link to an actual science project, much less an open source one.
>
> Many thanks for any pointers!
>
> Kevin
In oceanography: it is used in the shipboard ADCP data acquisition and 
processing systems, presently installed on 20 ships.
http://currents.soest.hawaii.edu/docs/adcp_doc/index.html
http://currents.soest.hawaii.edu/uhdas_fromships.html
Eric

Hey! :o)
This should be simple, but i cant manage: I need to plot many dots with the
same x, like
plt.plot([3,3,3,3],[60,80,120,180],'+',markersize=8,mec='k')
The array for x values is silly, especially since the number of y values
may be rather large. Is there a way to enter a constant there?
Cheers to you all!
Ulli

At 10:25am -0400 2012年6月05日, Tom Dimiduk wrote:
> On 06/05/2012 10:14 AM, Kevin Hunter wrote:
>> At 10:47pm -0400 2012年6月03日, Tom Dimiduk wrote:
>>> Very few people outside my group use it at the moment, but that
>>> looks to be changing at least a bit. I will hopefully get a paper
>>> out about the code by the end of the summer.
>>
>> I'm in a similar boat with the research on which I'm working, paper
>> and all. I don't know if folks will end up using it or not, but at
>> least it is available (github), if not well advertised to the
>> (decidedly small) niche of folks who would be interested.
>
> What is your project?
Heh. It didn't occur to me that I should answer my own question! :-)
http://temoaproject.org/
Briefly an energy-economy optimization (EEO) model and surrounding 
tools. If you just learned what that means, well ... welcome to the 
(decidedly small) niche!
> Like probably anyone in this situation, I have written a bunch of little
> convenience tools working with images, a simple matplotlib based gui to
> provide richer imshow image interaction (clicking to get pixel
> coordinates), more user friendly wrappers around scipy functions to do
> what is at least the most common case for us, and things of that sort.
>
> Is any of this stuff I should be looking to upstream or split off into
> the start of a scientific imaging library for python?
Potentially. I'm haven't explored that area for my research yet, but I 
*do* plan for a GUI. (Oh, but if plans were worth a nickel ...) For 
the types of analysis one generally (well, currently, anyway) does with 
EEO models, static graphics seem to be the method du jour. Thus, I'm 
not to the point of manipulating graphics yet, just generating various 
y(x) graphs with my scripts for later consumption.
Unfortunately, what we (I) do with our various ad-hoc scripts is not at 
all integrated yet, so we are currently just a (thankful) consumer.
Cheers,
Kevin

If I'm not wrong, the python packages at the Space Telescope Institute
use matplotlib extensively for astronomical use
(http://www.stsci.edu/institute/software_hardware/pyraf), and provide
a hook to the IRAF image libraries
(http://www.stsci.edu/institute/software_hardware/pyraf). Too much to
briefly summarize. I use matplotlib myself for the calibration and
data reduction of the Swift UVOT grism spectra (which is Astronomy).
Paul
On Tue, Jun 5, 2012 at 3:42 PM, Youngung Jeong <you...@gm...> wrote:
> I use matplotlib for my pole figure plotting. Pole figure is a 2D graphical
> method to represent the 3D crystallographic orientation of various crystal
> structures. And like most of scientific small tools, though I didn't mean to
> make it private, I have been the only user of my own program...
> Anyway, anyone is welcome to the git repo:
>
> https://github.com/youngung/PoleFigure.git
>
>
>  Youngung Jeong, 정영웅
>
>
>
>
> On Tue, Jun 5, 2012 at 8:31 AM, Alejandro Weinstein
> <ale...@gm...> wrote:
>>
>> On Tue, Jun 5, 2012 at 8:12 AM, Kevin Hunter <kmh...@nc...> wrote:
>> > At 8:15pm -0400 2012年6月03日, Josef wrote:
>> >> On Sun, Jun 3, 2012 at 7:41 PM, Kevin Hunter wrote:
>> >>> I've just spent 20 minutes of searching with various terms and no luck
>> >>> finding even one answer: What open source projects use matplotlib?
>> >
>> >> Maybe scanning the Debian required and recommended dependencies might
>> >> be informative.
>> >> (I wouldn't know how to do it.)
>> >
>>
>> Along the same lines, it is possible to search for repositories at
>> github that use Matplotlib. For example:
>>
>> http://bit.ly/Liibvq
>>
>> gives 72 repositories (there might be some duplicates).
>>
>> Alejandro.
>>
>>
>> ------------------------------------------------------------------------------
>> Live Security Virtual Conference
>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
-- 
* * * * * * * * http://www.mssl.ucl.ac.uk/~npmk/ * * * *
Dr. N.P.M. Kuin   (np...@ms...)
phone +44-(0)1483 (prefix) -204256 (work) -276110 (home)
mobile +44(0)7806985366 skype ID: npkuin
Mullard Space Science Laboratory – University College London –
Holmbury St Mary – Dorking – Surrey RH5 6NT– U.K.

Hi, use apt-rdepends with reverse modo:
apt-rdepends -r python-matplotlib
Leyendo lista de paquetes... Hecho
Creando árbol de dependencias
Leyendo la información de estado... Hecho
python-matplotlib
 Reverse Depende: epigrass (2.0.3-1)
 Reverse Depende: gastables (0.3-2)
 Reverse Depende: model-builder (0.4.1-5)
 Reverse Depende: nulog (2.0.dfsg.1-2)
 Reverse Depende: psychopy (1.61.03.dfsg-1)
 Reverse Depende: pwrkap-gui (7.30-5)
 Reverse Depende: python-csa (0.0.4-1.1)
 Reverse Depende: python-matplotlib-dbg (= 0.99.3-1)
 Reverse Depende: python-pyopencl (0.92-1)
 Reverse Depende: python-pytools (10-7)
 Reverse Depende: pytrainer (1.7.2-1)
 Reverse Depende: reinteract (0.5.0-3)
epigrass
gastables
model-builder
nulog
psychopy
pwrkap-gui
python-csa
python-matplotlib-dbg
python-pyopencl
python-pytools
 Reverse Depende: python-pyopencl (>= 0.92-1)
pytrainer
reinteract
I use in my project, pychemqt <http://pychemqt.sourceforge.net/>, and the
pyqt gui from freesteam <http://freesteam.sourceforge.net/>.
2012年6月5日 Kevin Hunter <kmh...@nc...>
> At 8:15pm -0400 2012年6月03日, Josef wrote:
> > On Sun, Jun 3, 2012 at 7:41 PM, Kevin Hunter wrote:
> >> I've just spent 20 minutes of searching with various terms and no luck
> >> finding even one answer: What open source projects use matplotlib?
>
> > Maybe scanning the Debian required and recommended dependencies might
> > be informative.
> > (I wouldn't know how to do it.)
>
> This is a good idea. Heh, one that requires more time investment than I
> was hoping after a simple search, but a good idea nonetheless.
>
> Thanks,
>
> Kevin
>
>

I use matplotlib for my pole figure plotting. Pole figure is a 2D graphical
method to represent the 3D crystallographic orientation of various crystal
structures. And like most of scientific small tools, though I didn't mean
to make it private, I have been the only user of my own program...
Anyway, anyone is welcome to the git repo:
https://github.com/youngung/PoleFigure.git
* Youngung Jeong, 정영웅*
On Tue, Jun 5, 2012 at 8:31 AM, Alejandro Weinstein <
ale...@gm...> wrote:
> On Tue, Jun 5, 2012 at 8:12 AM, Kevin Hunter <kmh...@nc...> wrote:
> > At 8:15pm -0400 2012年6月03日, Josef wrote:
> >> On Sun, Jun 3, 2012 at 7:41 PM, Kevin Hunter wrote:
> >>> I've just spent 20 minutes of searching with various terms and no luck
> >>> finding even one answer: What open source projects use matplotlib?
> >
> >> Maybe scanning the Debian required and recommended dependencies might
> >> be informative.
> >> (I wouldn't know how to do it.)
> >
>
> Along the same lines, it is possible to search for repositories at
> github that use Matplotlib. For example:
>
> http://bit.ly/Liibvq
>
> gives 72 repositories (there might be some duplicates).
>
> Alejandro.
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

On 06/05/2012 10:14 AM, Kevin Hunter wrote:
> At 10:47pm -0400 2012年6月03日, Tom Dimiduk wrote:
>> Very few people outside my group use it at the moment, but that looks
>> to be changing at least a bit. I will hopefully get a paper out about
>> the code by the end of the summer.
>
> I'm in a similar boat with the research on which I'm working, paper and
> all. I don't know if folks will end up using it or not, but at least it
> is available (github), if not well advertised to the (decidedly small)
> niche of folks who would be interested.
>
What is your project?
Like probably anyone in this situation, I have written a bunch of little 
convenience tools working with images, a simple matplotlib based gui to 
provide richer imshow image interaction (clicking to get pixel 
coordinates), more user friendly wrappers around scipy functions to do 
what is at least the most common case for us, and things of that sort.
Is any of this stuff I should be looking to upstream or split off into 
the start of a scientific imaging library for python?

On Tue, Jun 5, 2012 at 8:12 AM, Kevin Hunter <kmh...@nc...> wrote:
> At 8:15pm -0400 2012年6月03日, Josef wrote:
>> On Sun, Jun 3, 2012 at 7:41 PM, Kevin Hunter wrote:
>>> I've just spent 20 minutes of searching with various terms and no luck
>>> finding even one answer: What open source projects use matplotlib?
>
>> Maybe scanning the Debian required and recommended dependencies might
>> be informative.
>> (I wouldn't know how to do it.)
>
Along the same lines, it is possible to search for repositories at
github that use Matplotlib. For example:
http://bit.ly/Liibvq
gives 72 repositories (there might be some duplicates).
Alejandro.

On 6/3/12 6:41 PM, Kevin Hunter wrote:
> I'm especially interested in open source/science/ projects that use
> matplotlib.
Sage (sagemath.org) uses matplotlib for nearly all its 2d graphics.
Jason

At 3:31pm -0400 2012年6月04日, Michael Droettboom wrote:
> This is one of the big challenges of open science right now, in my
> opinion, is how to better share the *applications* for science
> rather than just the *libraries*.
This is a good point. I've had similar observations but haven't been 
able to voice this particular facet, and certainly not so succinctly.
One thought I had, assuming John Hunter et al. would be open to it, is 
basically having a "Who uses matplotlib?" section on the website. Good 
for one-off cases like my question two days ago, and also good for 
general project evangelism.
Cheers,
Kevin

At 10:47pm -0400 2012年6月03日, Tom Dimiduk wrote:
> Very few people outside my group use it at the moment, but that looks
> to be changing at least a bit. I will hopefully get a paper out about
> the code by the end of the summer.
I'm in a similar boat with the research on which I'm working, paper and 
all. I don't know if folks will end up using it or not, but at least it 
is available (github), if not well advertised to the (decidedly small) 
niche of folks who would be interested.
Cheers,
Kevin

At 8:15pm -0400 2012年6月03日, Josef wrote:
> On Sun, Jun 3, 2012 at 7:41 PM, Kevin Hunter wrote:
>> I've just spent 20 minutes of searching with various terms and no luck
>> finding even one answer: What open source projects use matplotlib?
> Maybe scanning the Debian required and recommended dependencies might
> be informative.
> (I wouldn't know how to do it.)
This is a good idea. Heh, one that requires more time investment than I 
was hoping after a simple search, but a good idea nonetheless.
Thanks,
Kevin