matplotlib-users

[Matplotlib-users] problem using matplotlib

[marc s. <m_s...@ho...>]

Just installed matplotlib and tried an example from the homepage:

Python 2.3.3 (#2, Mar 12 2004, 16:09:39)
[GCC 3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>import matplotlib.matlab
Numeric import failed... trying numarray.
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/local/lib/python2.3/site-packages/matplotlib/matlab.py", line 
126, in ?
    from axes import Axes
  File "/usr/local/lib/python2.3/site-packages/matplotlib/axes.py", line 
244, in ?
    class Axes(Artist):
  File "/usr/local/lib/python2.3/site-packages/matplotlib/axes.py", line 
814, in Axe                                            s
    def imshow(self, X, cmap = Grayscale(256)):
  File "/usr/local/lib/python2.3/site-packages/matplotlib/colors.py", line 
213, in _                                            _init__
    Colormap.__init__(self, N, 'gray')
  File "/usr/local/lib/python2.3/site-packages/matplotlib/colors.py", line 
96, in __                                            init__
    self._make_red()
  File "/usr/local/lib/python2.3/site-packages/matplotlib/colors.py", line 
118, in _                                            make_red
    self.red = 1.0/self.N*arange(self.N, typecode=Float)
TypeError: arange() got an unexpected keyword argument 'typecode'

Why is this?
Any suggestions?

thanks,
marc

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[Matplotlib-users] problem using matplotlib

[Marc S. <m_s...@ho...>]

I just installed the latest matplotlib and wanted to run
the first example from the homepage.
But I got:

Python 2.3.3 (#2, Mar 12 2004, 16:09:39)
[GCC 3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import matplotlib.matlab
Numeric import failed... trying numarray.
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File "/usr/local/lib/python2.3/site-packages/matplotlib/matlab.py", 
line 126, in ?
     from axes import Axes
   File "/usr/local/lib/python2.3/site-packages/matplotlib/axes.py", 
line 244, in ?
     class Axes(Artist):
   File "/usr/local/lib/python2.3/site-packages/matplotlib/axes.py", 
line 814, in Axe                                            s
     def imshow(self, X, cmap = Grayscale(256)):
   File "/usr/local/lib/python2.3/site-packages/matplotlib/colors.py", 
line 213, in _                                            _init__
     Colormap.__init__(self, N, 'gray')
   File "/usr/local/lib/python2.3/site-packages/matplotlib/colors.py", 
line 96, in __                                            init__
     self._make_red()
   File "/usr/local/lib/python2.3/site-packages/matplotlib/colors.py", 
line 118, in _                                            make_red
     self.red = 1.0/self.N*arange(self.N, typecode=Float)
TypeError: arange() got an unexpected keyword argument 'typecode'



Any suggestions?

thanks,
marc

[Matplotlib-users] polar plots... again...

[Peter G. <pgr...@ge...>]

Hello:

I am currently using matplotlib for all the plotting in the software I am writing. I will however need to produce polar plots. As John has mentioned they should be added at one point. So my shameless question is roughly what version could I expect them to be included in? My options are to either wait for it, write it on my own, or write a simple interface (for my code) to GNUPlot or some other tool. I have not done very much poking around in the current matplotlib libraries (other than changing some rather minor details) and have a feeling that this might take me the longest. Interfacing GNUPLot to my code would not take more than a few hours, but I would prefer to stay with matplotlib. 

Thanks for the great work.
Best,

-- 
Peter Groszkowski         Gemini Observatory
Tel: +1 808 974-2509      670 N. A'ohoku Place
Fax: +1 808 935-9235      Hilo, Hawai'i 96720, USA

Re: [Matplotlib-users] polar plots... again...

[Greg W. <gr...@th...>]

As a temporary solution you might try just transforming your r,theta
data to x, y and then drawing a grid over it.

I looked at the classes and with the loglog already done as an example,
it shouldn't be too hard to add polar plotting.  So far though I haven't
got any further than printing out some of the code.

Here's a very rough example of a workaround.

#!/usr/bin/python
from Numeric import *
from matplotlib.matlab import *
 
def drawgrid(sp,rticlevels,thetaticlevels):
    for r in rticlevels:
        theta = arange(0,2*pi+0.05,0.05)
        x = r*cos(theta)
        y = r*sin(theta)
        sp.plot(x,y,'k-')
    for theta in thetaticlevels:
        x = rticlevels[-1]*cos(theta)
        y = rticlevels[-1]*sin(theta)
        sp.plot([0,x],[0,y],'k-')
 
def polar(sp,r,theta,marker,rticlevels,thetaticlevels):
    x = r*cos(theta)
    y = r*sin(theta)
    sp.plot(x,y,marker)
    drawgrid(sp,rticlevels,thetaticlevels)
    return sp
 
sp = subplot(111)
theta = arange(0,pi,0.1)
r = 0.5 + cos(theta)
polar(sp,r,theta,'b-',arange(0.5,2.0,0.5),arange(0.,2*pi,pi/9.))


On Tue, 2004-03-30 at 14:32, Peter Groszkowski wrote:
> Hello:
> 
> I am currently using matplotlib for all the plotting in the software I am writing. I will however need to produce polar plots. As John has mentioned they should be added at one point. So my shameless question is roughly what version could I expect them to be included in? My options are to either wait for it, write it on my own, or write a simple interface (for my code) to GNUPlot or some other tool. I have not done very much poking around in the current matplotlib libraries (other than changing some rather minor details) and have a feeling that this might take me the longest. Interfacing GNUPLot to my code would not take more than a few hours, but I would prefer to stay with matplotlib. 
> 
> Thanks for the great work.
> Best,

Re: [Matplotlib-users] polar plots... again...

[John H. <jdh...@ac...>]

>>>>> "Greg" == Greg Whittier <gr...@th...> writes:

    Greg> As a temporary solution you might try just transforming your
    Greg> r,theta data to x, y and then drawing a grid over it.

A nice workaround.  You may want to add 

  axis('off')

To get rid of the background axes.
 
    Greg> I looked at the classes and with the loglog already done as
    Greg> an example, it shouldn't be too hard to add polar plotting.
    Greg> So far though I haven't got any further than printing out
    Greg> some of the code.

I was planning on taking a different tack, and derive a PolarAxes from
Axes and RadialAxis from Axis, etc, which uses circles rather then
lines for the radial gridlines, and so on. But you get so close with
so little code that your approach may be better.  If you want to keep
forging ahead, I'm happy to leave the ball in your court.

On an unrelated note,

  from Numeric import *
  from matplotlib.matlab import *

is redundant because matplotlib.matlab imports all of numeric/numarray
as well as MLab, fft, and some stuff from LinearAlgebra and Matrix.
This is to provide a matlab like environment where most of the things
you need are there.

JDH

Re: [Matplotlib-users] polar plots... again...

[Greg W. <gr...@th...>]

One thing I'm not sure of is just how polar plots are supposed to work. 
If you set the axis background color, what gets colored?  To get that
right (if "in the circle" is right), I guess you'd need a new Axes
class.

In gnuplot, everything is drawn in the rectangle.  "set polar; set grid;
plot sin(3*t)" gives you a rectangular grid.  You have to do "set grid
polar" to circles.  Of course gnuplot isn't what we're going for (How do
you change background color?  The only way I know is using xresources.)

I guess the answer should be what matlab does (unless we can think of
something better).  Now I've never used matlab, so this will take a
little research.  I borrowed a matlab graphics book and will take a
peek.

Keep up the good work.

Thanks,
Greg

PS  Say hi to hyde park for me.  I graduated in 98.

On Wed, 2004-03-31 at 07:54, John Hunter wrote:
> >>>>> "Greg" == Greg Whittier <gr...@th...> writes:
> 
>     Greg> As a temporary solution you might try just transforming your
>     Greg> r,theta data to x, y and then drawing a grid over it.
> 
> A nice workaround.  You may want to add 
> 
>   axis('off')
> 
> To get rid of the background axes.
>  
>     Greg> I looked at the classes and with the loglog already done as
>     Greg> an example, it shouldn't be too hard to add polar plotting.
>     Greg> So far though I haven't got any further than printing out
>     Greg> some of the code.
> 
> I was planning on taking a different tack, and derive a PolarAxes from
> Axes and RadialAxis from Axis, etc, which uses circles rather then
> lines for the radial gridlines, and so on. But you get so close with
> so little code that your approach may be better.  If you want to keep
> forging ahead, I'm happy to leave the ball in your court.
> 
> On an unrelated note,
> 
>   from Numeric import *
>   from matplotlib.matlab import *
> 
> is redundant because matplotlib.matlab imports all of numeric/numarray
> as well as MLab, fft, and some stuff from LinearAlgebra and Matrix.
> This is to provide a matlab like environment where most of the things
> you need are there.
> 
> JDH
> 
> 
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Greg Whittier <gr...@th...>