diff --git a/control/pzmap.py b/control/pzmap.py
index 400db2807..f1d0ecae9 100644
--- a/control/pzmap.py
+++ b/control/pzmap.py
@@ -79,11 +79,13 @@ class PoleZeroData:
System name.
sys : StateSpace or TransferFunction
System corresponding to the data.
+ sort_loci : bool, optional
+ Set to False to turn off sorting of loci into unique branches.
"""
def __init__(
self, poles, zeros, gains=None, loci=None, dt=None, sysname=None,
- sys=None):
+ sys=None, sort_loci=True):
"""Create a pole/zero map object.
Parameters
@@ -102,10 +104,14 @@ def __init__(
System corresponding to the data.
"""
+ from .rlocus import _RLSortRoots
self.poles = poles
self.zeros = zeros
self.gains = gains
- self.loci = loci
+ if loci is not None and sort_loci:
+ self.loci = _RLSortRoots(loci)
+ else:
+ self.loci = loci
self.dt = dt
self.sysname = sysname
self.sys = sys
@@ -187,7 +193,7 @@ def pole_zero_plot(
----------
data : List of PoleZeroData objects or LTI systems
List of pole/zero response data objects generated by pzmap_response()
- or rootlocus_response() that are to be plotted. If a list of systems
+ or root_locus_map() that are to be plotted. If a list of systems
is given, the poles and zeros of those systems will be plotted.
grid : bool or str, optional
If `True` plot omega-damping grid, if `False` show imaginary axis
diff --git a/control/rlocus.py b/control/rlocus.py
index 54c672997..c14d1e315 100644
--- a/control/rlocus.py
+++ b/control/rlocus.py
@@ -88,7 +88,7 @@ def root_locus_map(sysdata, gains=None):
root_array = _RLSortRoots(root_array)
responses.append(PoleZeroData(
- sys.poles(), sys.zeros(), kvect, root_array,
+ sys.poles(), sys.zeros(), kvect, root_array, sort_loci=False,
dt=sys.dt, sysname=sys.name, sys=sys))
if isinstance(sysdata, (list, tuple)):
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