Fix docstring, and add reference to slycot.ab13dd

roryyorke · roryyorke · commit c941cddbe8b8 · 2022-04-27T07:09:24.000+02:00
diff --git a/control/statesp.py b/control/statesp.py
@@ -1910,16 +1910,17 @@ def linfnorm(sys, tol=1e-10):
     -------
     gpeak : non-negative scalar
       L-infinity norm
-    fpeak : non-negatie scalar
+    fpeak : non-negative scalar
       Frequency, in rad/s, at which gpeak occurs
 
     For stable systems, the L-infinity and H-infinity norms are equal;
     for unstable systems, the H-infinity norm is infinite, while the
     L-infinity norm is finite if the system has no poles on the
     imaginary axis.
 
-    For systems with an undefined time base (i.e., sys.dt is None), a
-    ValueError is raised.
+    See also
+    --------
+    slycot.ab13dd : the Slycot routine linfnorm that does the calculation
     """
 
     if ab13dd is None:
