[Matplotlib-users] plot with marker color coded according to z-value

2012-10-19 Thread elmar werling 
Hi,

is there a way to adjust the marker color in a xy-plot in relation to 
the value of a third parameter. Something as the following - not working 
- example 1.

Example 2 is working but rather slow for large arrays.

cheers
Elmar




# example 1

import matplotlib.pyplot as plt

x = [1,2,3,4]
y = x
c = ((1.0, 0.0, 0.0), (0.8, 0.1, 0.1), (0.6, 0.2, 0.6), (0.4, 0.3, 0.3))

plt.plot(x,y, color=c, marker='s')
plt.show()


example 2:

import matplotlib.pyplot as plt

x = [1,2,3,4]
y = x
c = ((1.0, 0.0, 0.0), (0.8, 0.1, 0.1), (0.6, 0.2, 0.6), (0.4, 0.3, 0.3))

for i in range(len(x)):
 plt.plot(x[i], y[i], color=c[i], marker='s')

plt.show()


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Re: [Matplotlib-users] plot with marker color coded according to z-value

2012-10-19 Thread elmar werling 
thanks for help,

finally I found the following solution

elmar


import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt

N = 200
x = np.linspace(0,1,N)
y = np.random.randn(N)
z = np.random.randn(N)*2+5

cm = mpl.cm.get_cmap('RdYlBu')
sc = plt.scatter(x, y, c=z, vmin=min(z), vmax=max(z), s=35, cmap=cm)
plt.colorbar(sc)

plt.show()



Am 19.10.2012 21:59, schrieb Joe Kington:
  plt.scatter(x, y, c=z, marker='s')
  plt.colorbar()



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Re: [Matplotlib-users] plot with marker color coded according to z-value

2012-10-19 Thread elmar werling 
Am 19.10.2012 23:26, schrieb Damon McDougall:
 Correct me if I'm wrong, but I don't even think you need them. I think
 the default cmap behaviour is to normalise to the min and max of the
 data.

yes, default cmap behaviour will normalise to the min and max of the
data.



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[Matplotlib-users] python3 and matplotlib installation problem

2012-07-28 Thread elmar werling 
Hi,

just installed matplotlib by doing

git clone https://github.com/matplotlib/matplotlib
cd matplotlib
python3 setup.py build
sudo python3 setup.py install

When I import matplotlib.pyplot I get the following error message.

Any help is wellcome
Elmar



Python 3.2.1 (default, Jul 18 2011, 16:24:40) [GCC] on linux2
Type copyright, credits or license() for more information.
  import numpy
  import matplotlib
  numpy.__version__
'1.6.2'
  matplotlib.__version__
'1.2.x'
  import matplotlib.pyplot
Traceback (most recent call last):
   File pyshell#4, line 1, in module
 import matplotlib.pyplot
   File /usr/local/lib/python3.2/site-packages/matplotlib/pyplot.py, 
line 26, in module
 from matplotlib.figure import Figure, figaspect
   File /usr/local/lib/python3.2/site-packages/matplotlib/figure.py, 
line 19, in module
 from .axes import Axes, SubplotBase, subplot_class_factory
   File /usr/local/lib/python3.2/site-packages/matplotlib/axes.py, 
line 21, in module
 import matplotlib.dates as mdates
   File /usr/local/lib/python3.2/site-packages/matplotlib/dates.py, 
line 122, in module
 from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, \
   File /usr/local/lib/python3.2/site-packages/dateutil/rrule.py, line 55
 raise ValueError, Can't create weekday with n == 0
 ^
SyntaxError: invalid syntax
 


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Re: [Matplotlib-users] python3 and matplotlib installation problem

2012-07-28 Thread elmar werling 
Am 28.07.2012 21:46, schrieb Christoph Gohlke:
 On 7/28/2012 12:29 PM, elmar werling wrote:
 Hi,

 just installed matplotlib by doing

 git clone https://github.com/matplotlib/matplotlib
 cd matplotlib
 python3 setup.py build
 sudo python3 setup.py install

 When I import matplotlib.pyplot I get the following error message.

 Any help is wellcome
 Elmar



 Python 3.2.1 (default, Jul 18 2011, 16:24:40) [GCC] on linux2
 Type copyright, credits or license() for more information.
 import numpy
 import matplotlib
 numpy.__version__
 '1.6.2'
 matplotlib.__version__
 '1.2.x'
 import matplotlib.pyplot
 Traceback (most recent call last):
  File pyshell#4, line 1, in module
import matplotlib.pyplot
  File /usr/local/lib/python3.2/site-packages/matplotlib/pyplot.py,
 line 26, in module
from matplotlib.figure import Figure, figaspect
  File /usr/local/lib/python3.2/site-packages/matplotlib/figure.py,
 line 19, in module
from .axes import Axes, SubplotBase, subplot_class_factory
  File /usr/local/lib/python3.2/site-packages/matplotlib/axes.py,
 line 21, in module
import matplotlib.dates as mdates
  File /usr/local/lib/python3.2/site-packages/matplotlib/dates.py,
 line 122, in module
from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, 
 \
  File /usr/local/lib/python3.2/site-packages/dateutil/rrule.py, line 55
raise ValueError, Can't create weekday with n == 0
^
 SyntaxError: invalid syntax





 Install python-dateutil 2.1 http://labix.org/python-dateutil/. Do not
 use not dateutil 1.5 or the version included with matplotlib.

 See also https://github.com/matplotlib/matplotlib/issues/983

 Christoph

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thank you,

will test it tommorow, first i have to install setuptools


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Re: [Matplotlib-users] Problem with ani.save

2011-12-29 Thread elmar werling 

yeap, thanks a lot.

after installing ffmpeg everything is working smoothly.



On 29.12.2011 12:12, Fabrice Silva wrote:
 It seems that the Animation.save method assume that ffmpeg is installed,
 as there is no cmd_gen keyword argument for this method.

 As a quick and dirty fix, you may change the imposed commandline
 constructor overloading the ffmpeg_cmd method

  ani.ffmpeg_cmd = ani.mencoder_cmd

 or, if you prefer using gstreamer, something like that (not tested)
  def gst_cmd(fname, fps, codec, frame_prefix):
  cmd = 'gst-launch multifilesrc location={prefix}%%04d.png 
 index={i0} num-buffers={nb} '\
 'caps=image/png,framerate=\(fraction\){fps}/1 ! pngdec ! 
 ffmpegcolorspace ! '\
 '{codec_f} ! filesink location={fname} '
 nb_frames = len([tmp for tmp in os.listdir('./') if 
 tmp.endswith('.png') and tmp.startswith(frame_prefix)])
 return cmd.format(prefix=frame_prefix, i0=0, nb=nb_frames, 
 fps=fps, codec_f=codec+'mux', fname=fname)

  ani.ffmpeg_cmd = gst_cmd



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[Matplotlib-users] Problem with ani.save

2011-12-29 Thread elmar werling 
Hi,

running the AnimatedImage.py I get the appended error message.

What's wrong?

Cheers
Elmar



In [5]: run AnimatedImage.py
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (23, 0))
---
OSError   Traceback (most recent call last)
/usr/local/lib/python2.7/dist-packages/IPython/utils/py3compat.pyc in 
execfile(fname, *where)
 173 else:
 174 filename = fname
-- 175 __builtin__.execfile(filename, *where)

/home/elmar/PyScripts/examples_mpl/AnimatedImage.py in module()
  27 repeat_delay=1000)
  28
--- 29 ani.save('dynamic_images.mp4')
  30
  31

/usr/local/lib/python2.7/dist-packages/matplotlib/animation.pyc in 
save(self, filename, fps, codec, clear_temp, frame_prefix)
 125 self._fig.savefig(fname)
 126
-- 127 self._make_movie(filename, fps, codec, frame_prefix)
 128
 129 #Delete temporary files


/usr/local/lib/python2.7/dist-packages/matplotlib/animation.pyc in 
_make_movie(self, fname, fps, codec, frame_prefix, cmd_gen)
 162 verbose.report('Animation._make_movie running command: 
%s'%' '.join(command))
 163 proc = Popen(command, shell=False,
-- 164 stdout=PIPE, stderr=PIPE)
 165 proc.wait()
 166

/usr/lib/python2.7/subprocess.pyc in __init__(self, args, bufsize, 
executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, 
env, universal_newlines, startupinfo, creationflags)
 677 p2cread, p2cwrite,
 678 c2pread, c2pwrite,
-- 679 errread, errwrite)
 680
 681 if mswindows:

/usr/lib/python2.7/subprocess.pyc in _execute_child(self, args, 
executable, preexec_fn, close_fds, cwd, env, universal_newlines, 
startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, 
errread, errwrite)
1237 if fd is not None:
1238 os.close(fd)
- 1239 raise child_exception
1240
1241



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[Matplotlib-users] Ternary Plot

2011-11-03 Thread elmar werling 
Hi,

could not found anything like plot_ternary() in the matplotlib 
documentation. Is there an easy to use method to plot data points and 
lines in a ternary plot using matplotlib?

Any hint is wellcome

Elmar


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