update docstring for statefbk inputs

bnavigator · bnavigator · commit 5a9e4332bab0 · 2020-12-30T01:32:33.000+01:00
diff --git a/control/statefbk.py b/control/statefbk.py
@@ -41,7 +41,7 @@
 
 # External packages and modules
 import numpy as np
-import scipy as sp
+
 from . import statesp
 from .mateqn import care
 from .statesp import _ssmatrix
@@ -59,11 +59,11 @@ def place(A, B, p):
 
     Parameters
     ----------
-    A : 2D array
+    A : 2D array_like
         Dynamics matrix
-    B : 2D array
+    B : 2D array_like
         Input matrix
-    p : 1D list
+    p : 1D array_like
         Desired eigenvalue locations
 
     Returns
@@ -133,11 +133,11 @@ def place_varga(A, B, p, dtime=False, alpha=None):
 
     Required Parameters
     ----------
-    A : 2D array
+    A : 2D array_like
         Dynamics matrix
-    B : 2D array
+    B : 2D array_like
         Input matrix
-    p : 1D list
+    p : 1D array_like
         Desired eigenvalue locations
 
     Optional Parameters
@@ -264,9 +264,9 @@ def lqe(A, G, C, QN, RN, NN=None):
 
     Parameters
     ----------
-    A, G : 2D array
+    A, G : 2D array_like
         Dynamics and noise input matrices
-    QN, RN : 2D array
+    QN, RN : 2D array_like
         Process and sensor noise covariance matrices
     NN : 2D array, optional
         Cross covariance matrix
@@ -324,9 +324,9 @@ def acker(A, B, poles):
 
     Parameters
     ----------
-    A, B : 2D arrays
+    A, B : 2D array_like
         State and input matrix of the system
-    poles : 1D list
+    poles : 1D array_like
         Desired eigenvalue locations
 
     Returns
