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[Octave-bug-tracker] [bug #44949] rlocus gives discontinuous data


From: Doug Stewart
Subject: [Octave-bug-tracker] [bug #44949] rlocus gives discontinuous data
Date: Tue, 28 Apr 2015 20:24:19 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36

Follow-up Comment #1, bug #44949 (project octave):

I can confirm this with rc3.

I did some digging anf found that what is happening is that the roots to plot
are changing order as can be seen here:
Columns 124 through 126:

  -4.91518 + 0.00000i  -4.91220 + 0.00000i  -2.04537 + 4.47197i
  -2.04241 + 4.42627i  -2.04390 + 4.44917i  -4.90925 + 0.00000i
  -2.04241 - 4.42627i  -2.04390 - 4.44917i  -2.04537 - 4.47197i

 Columns 127 and 128:

  -2.04682 + 4.49466i  -2.04826 + 4.51726i
  -4.90635 + 0.00000i  -4.90349 + 0.00000i
  -2.04682 - 4.49466i  -2.04826 - 4.51726i
>>

 In col. 125 and 126 we can see that the real branch has moved from first in
the list to second, and thus the plot has the funny lines in it.

I ran this line to get this data:
[rldata_pd k_list_pd] = rlocus(G_pd*G, 0.21, 0,  26.);



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