[Octave-bug-tracker] [bug #55176] polar plot does not plot rho axis correctly for negative rho values

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?55176>

                 Summary: polar plot does not plot rho axis correctly for
negative rho values
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 06 Dec 2018 11:37:59 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: Any

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Details:

bug #53999 solution claims to have fixed plotting of negative rho values
however a simple example (provided with polar.m!) shows this not to be the
case:


clf;
theta = linspace (0,2*pi,1000);
rho = sin (7*theta);
polar (theta, rho);
title ("polar() plot");


Negative values of rho appear to be plotted in the centre. In particular this
means its impossible to plot antenna patterns which typically have negative
gains (i.e. rho values) at many angles (i.e. theta values). Attempting to set
the axis does not work either. Note this does not appear to work in Matlab
either.




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