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rlocus with kvect argument doesn't compute good limits #787
Description
Example:
import control as ct
g = ct.tf([1,2], [1,2,10])
kvect = ct.rlocus(g)[1]
plt.figure()
ct.rlocus(g, kvect=kvect);result:
I'd expect these two to look the same.
This is because axis limits are only calculated when argument kvect is None:
if kvect is None:
start_mat = _RLFindRoots(nump, denp, [1])
kvect, mymat, xlim, ylim = _default_gains(nump, denp, xlim, ylim)
else:
start_mat = _RLFindRoots(nump, denp, [kvect[0]])
mymat = _RLFindRoots(nump, denp, kvect)
mymat = _RLSortRoots(mymat)
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