changed color of root locus pole markers to black instead of randomly-changing colors in sisotool

sawyerbfuller · sawyerbfuller · commit ffd7b5fbd4e0 · 2021-11-05T14:34:53.000-07:00
diff --git a/control/rlocus.py b/control/rlocus.py
@@ -180,7 +180,7 @@ def root_locus(sys, kvect=None, xlim=None, ylim=None,
             fig.axes[1].plot(
                 [root.real for root in start_mat],
                 [root.imag for root in start_mat],
-                marker='s', markersize=8, zorder=20, label='gain_point')
+                marker='s', markersize=6, zorder=20, color='k', label='gain_point')
             s = start_mat[0][0]
             if isdtime(sys, strict=True):
                 zeta = -np.cos(np.angle(np.log(s)))
@@ -623,7 +623,7 @@ def _RLFeedbackClicksPoint(event, sys, fig, ax_rlocus, sisotool=False):
             ax_rlocus.plot(
                 [root.real for root in mymat],
                 [root.imag for root in mymat],
-                marker='s', markersize=8, zorder=20, label='gain_point')
+                marker='s', markersize=6, zorder=20, label='gain_point', color='k')
         else:
             ax_rlocus.plot(s.real, s.imag, 'k.', marker='s', markersize=8,
                            zorder=20, label='gain_point')
@@ -769,7 +769,7 @@ def _default_wn(xloc, yloc, max_lines=7):
 
     """
     sep = xloc[1]-xloc[0]       # separation between x-ticks
-    
+
     # Decide whether to use the x or y axis for determining wn
     if yloc[-1] / sep > max_lines*10:
         # y-axis scale >> x-axis scale
