print dt=True instead of unspecified

bnavigator · bnavigator · commit 460859368661 · 2021-04-11T20:10:55.000+02:00
diff --git a/control/statesp.py b/control/statesp.py
@@ -392,10 +392,7 @@ def __str__(self):
             for Mvar, M in zip(["A", "B", "C", "D"],
                                [self.A, self.B, self.C, self.D])])
         if self.isdtime(strict=True):
-            if self.dt is True:
-                string += "\ndt unspecified\n"
-            else:
-                string += f"\ndt = {self.dt}\n"
+            string += f"\ndt = {self.dt}\n"
         return string
 
     # represent to implement a re-loadable version
@@ -520,7 +517,7 @@ def fmt_matrix(matrix, name):
     def _latex_dt(self):
         if self.isdtime(strict=True):
             if self.dt is True:
-                return r"~,~dt~\mathrm{unspecified}"
+                return r"~,~dt=~\mathrm{True}"
             else:
                 fmt = config.defaults['statesp.latex_num_format']
                 return f"~,~dt={self.dt:{fmt}}"
diff --git a/control/tests/statesp_test.py b/control/tests/statesp_test.py
@@ -743,7 +743,7 @@ def test_str(self, sys322):
                 "     [ 0.  1.]]\n")
         assert str(tsys) == tref
         tsysdtunspec = StateSpace(tsys.A, tsys.B, tsys.C, tsys.D, True)
-        assert str(tsysdtunspec) == tref + "\ndt unspecified\n"
+        assert str(tsysdtunspec) == tref + "\ndt = True\n"
         sysdt1 = StateSpace(tsys.A, tsys.B, tsys.C, tsys.D, 1.)
         assert str(sysdt1) == tref + "\ndt = {}\n".format(1.)
 
@@ -1025,7 +1025,7 @@ def test_statespace_defaults(self, matarrayout):
 @pytest.mark.parametrize("dt, dtref",
                          [(0, ""),
                           (None, ""),
-                          (True, r"~,~dt~\mathrm{{unspecified}}"),
+                          (True, r"~,~dt=~\mathrm{{True}}"),
                           (0.1, r"~,~dt={dt:{fmt}}")])
 @pytest.mark.parametrize("repr_type", [None, "partitioned", "separate"])
 @pytest.mark.parametrize("num_format", [None, ".3g", ".5g"])
