Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-30 Thread John Hunter 
On Fri, Jan 30, 2009 at 12:28 AM, jamesf0 jame...@utas.edu.au wrote:

 Sorry, I have done that change, and get these errors:


 Traceback (most recent call last):
  File test7.py, line 36, in module
ax=fig.add_subplot(111, polar=True, resolution=1)
  File /usr/lib/python2.5/site-packages/matplotlib/figure.py, line 676, in
 add_subplot
a = subplot_class_factory(projection_class)(self, *args, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/axes.py, line 6823, in
 __init__
self._axes_class.__init__(self, fig, self.figbox, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/projections/polar.py,
 line 171, in __init__
Axes.__init__(self, *args, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/axes.py, line 537, in
 __init__
if len(kwargs): martist.setp(self, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/artist.py, line 894, in
 setp
func = getattr(o,funcName)
 AttributeError: 'PolarAxesSubplot' object has no attribute 'set_resolution'

What version of mpl are you using?  This should be fixed for releases = 0.98.4

JDH

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[Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread jamesf0 

Hi,

Im having some trouble with this seemingly simple task of plotting
straight lines/fitted curves on a polar plot.

I am trying to create a plot that resembles the layout of the chart seen
below:

http://www.nabble.com/file/p21721073/brisbane.png 



So far I have only been able to plot data like so:

http://www.nabble.com/file/p21721073/AzvAlt.png 


The blue line should be similar to the bottom line of the first example
plot. The line would ultimately be formed by fitting a straight line/curve
through the points, instead of the way matplotlib is plotting.

I am plotting tuples of values (az and alt), and plotting using:


ax.plot(az, alt, 'b')
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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread Jae-Joon Lee 
I don't see any elegant way to do that.

The easiest way I can think of is to use a derived line2d class.
Something like below will work. Others may have better ideas.


import matplotlib.lines

class Line2DNoInterpolation(matplotlib.lines.Line2D):

def recache(self):
matplotlib.lines.Line2D.recache(self)
self._transformed_path.get_transformed_path_and_affine = \
   self._transformed_path.get_transformed_points_and_affine



ax = subplot(111, projection=polar)

r = np.arange(0, 1.0, 0.1)
theta = 2*np.pi*r

p2 = Line2DNoInterpolation(theta, r, color='r', lw=1)
ax.add_line(p2)


-JJ


On Thu, Jan 29, 2009 at 12:20 AM, jamesf0 jame...@utas.edu.au wrote:

 Hi,

 Im having some trouble with this seemingly simple task of plotting
 straight lines/fitted curves on a polar plot.

 I am trying to create a plot that resembles the layout of the chart seen
 below:

 http://www.nabble.com/file/p21721073/brisbane.png



 So far I have only been able to plot data like so:

 http://www.nabble.com/file/p21721073/AzvAlt.png


 The blue line should be similar to the bottom line of the first example
 plot. The line would ultimately be formed by fitting a straight line/curve
 through the points, instead of the way matplotlib is plotting.

 I am plotting tuples of values (az and alt), and plotting using:


 ax.plot(az, alt, 'b')
 --
 View this message in context: 
 http://www.nabble.com/How-to-plot-straight-lines-on-polar-plots-tp21721073p21721073.html
 Sent from the matplotlib - users mailing list archive at Nabble.com.


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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread Michael Droettboom 
I'm embarrassed to see that I neglected to document this, but you can 
pass a resolution keyword argument to add_axes which sets the number 
of points of interpolation between each pair of data points.  Set this 
to 1 to disable interpolation.

This will be documented shortly.

Mike

jamesf0 wrote:
 Hi,

 Im having some trouble with this seemingly simple task of plotting
 straight lines/fitted curves on a polar plot.

 I am trying to create a plot that resembles the layout of the chart seen
 below:

 http://www.nabble.com/file/p21721073/brisbane.png 



 So far I have only been able to plot data like so:

 http://www.nabble.com/file/p21721073/AzvAlt.png 


 The blue line should be similar to the bottom line of the first example
 plot. The line would ultimately be formed by fitting a straight line/curve
 through the points, instead of the way matplotlib is plotting.

 I am plotting tuples of values (az and alt), and plotting using:


 ax.plot(az, alt, 'b')
   

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA


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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread jamesf0 

Thanks for the help, but I can't quite see where to add the add_axes code.
Here is the code I have been using to plot, the polar plot is a subplot.

fig=figure()
ax=fig.add_subplot(111, polar=True)
ax.set_xticklabels([E,45,N,315,W,225,S,135])
ax.set_yticklabels([80,70,60,50,40,30,20,10])

...

ax.plot(az, alt, 'b')
fig.savefig('AzvAlt.png')
show()




Michael Droettboom-3 wrote:
 
 I'm embarrassed to see that I neglected to document this, but you can 
 pass a resolution keyword argument to add_axes which sets the number 
 of points of interpolation between each pair of data points.  Set this 
 to 1 to disable interpolation.
 
 This will be documented shortly.
 
 Mike
 
 jamesf0 wrote:
 Hi,

 Im having some trouble with this seemingly simple task of plotting
 straight lines/fitted curves on a polar plot.

 I am trying to create a plot that resembles the layout of the chart seen
 below:

 http://www.nabble.com/file/p21721073/brisbane.png 



 So far I have only been able to plot data like so:

 http://www.nabble.com/file/p21721073/AzvAlt.png 


 The blue line should be similar to the bottom line of the first example
 plot. The line would ultimately be formed by fitting a straight
 line/curve
 through the points, instead of the way matplotlib is plotting.

 I am plotting tuples of values (az and alt), and plotting using:


 ax.plot(az, alt, 'b')
   
 
 -- 
 Michael Droettboom
 Science Software Branch
 Operations and Engineering Division
 Space Telescope Science Institute
 Operated by AURA for NASA
 
 
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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread Tim Michelsen 
Hello,

 I am trying to create a plot that resembles the layout of the chart seen
 below:

 http://www.nabble.com/file/p21721073/brisbane.png 
are you actually trying to plot sun path digrams?

May you share a part of your code once it is completed?

I'd be very interested in seeing a working example.

Kind regards,
Timme


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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread jamesf0 

Yeah trying to plot sun paths.

I'll be more than happy to share once it's complete.

James.


Timmie wrote:
 
 Hello,
 
 I am trying to create a plot that resembles the layout of the chart
 seen
 below:

 http://www.nabble.com/file/p21721073/brisbane.png 
 are you actually trying to plot sun path digrams?
 
 May you share a part of your code once it is completed?
 
 I'd be very interested in seeing a working example.
 
 Kind regards,
 Timme
 
 
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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread Jouni K . Seppänen 
jamesf0 jame...@utas.edu.au writes:

 Thanks for the help, but I can't quite see where to add the add_axes code.
 Here is the code I have been using to plot, the polar plot is a subplot.

 ax=fig.add_subplot(111, polar=True)

Change this to

  ax=fig.add_subplot(111, polar=True, resolution=1)

and the resolution will get passed to the PolarAxes instance.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks


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Re: [Matplotlib-users] How to plot straight lines on polar plots

2009-01-29 Thread jamesf0 

Sorry, I have done that change, and get these errors:


Traceback (most recent call last):
  File test7.py, line 36, in module
ax=fig.add_subplot(111, polar=True, resolution=1)
  File /usr/lib/python2.5/site-packages/matplotlib/figure.py, line 676, in
add_subplot
a = subplot_class_factory(projection_class)(self, *args, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/axes.py, line 6823, in
__init__
self._axes_class.__init__(self, fig, self.figbox, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/projections/polar.py,
line 171, in __init__
Axes.__init__(self, *args, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/axes.py, line 537, in
__init__
if len(kwargs): martist.setp(self, **kwargs)
  File /usr/lib/python2.5/site-packages/matplotlib/artist.py, line 894, in
setp
func = getattr(o,funcName)
AttributeError: 'PolarAxesSubplot' object has no attribute 'set_resolution'





Jouni K. Seppänen wrote:
 
 Change this to
 
   ax=fig.add_subplot(111, polar=True, resolution=1)
 
 and the resolution will get passed to the PolarAxes instance.
 
 -- 
 Jouni K. Seppänen
 http://www.iki.fi/jks
 

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