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,