Review

OpenMDAO · Jun 9, 2020 · 0130741 · 0130741
1 parent 6f42b93
commit 0130741
Showing 1 changed file with 23 additions and 22 deletions.
diff --git a/openmdao/core/implicitcomponent.py b/openmdao/core/implicitcomponent.py
@@ -105,30 +105,31 @@ def _guess_nonlinear(self):
         """
         Provide initial guess for states.
         """
-        self._inputs.read_only = self._residuals.read_only = True
-        complex_step = self._inputs._under_complex_step
+        if self._has_guess:
+            self._inputs.read_only = self._residuals.read_only = True
+            complex_step = self._inputs._under_complex_step
 
-        try:
-            with self._unscaled_context(outputs=[self._outputs], residuals=[self._residuals]):
+            try:
+                with self._unscaled_context(outputs=[self._outputs], residuals=[self._residuals]):
+                    if complex_step:
+                        self._inputs.set_complex_step_mode(False, keep_real=True)
+                        self._outputs.set_complex_step_mode(False, keep_real=True)
+                        self._residuals.set_complex_step_mode(False, keep_real=True)
+                    if self._discrete_inputs or self._discrete_outputs:
+                        self.guess_nonlinear(self._inputs, self._outputs, self._residuals,
+                                             self._discrete_inputs, self._discrete_outputs)
+                    else:
+                        self.guess_nonlinear(self._inputs, self._outputs, self._residuals)
+            finally:
                 if complex_step:
-                    self._inputs.set_complex_step_mode(False, keep_real=True)
-                    self._outputs.set_complex_step_mode(False, keep_real=True)
-                    self._residuals.set_complex_step_mode(False, keep_real=True)
-                if self._discrete_inputs or self._discrete_outputs:
-                    self.guess_nonlinear(self._inputs, self._outputs, self._residuals,
-                                         self._discrete_inputs, self._discrete_outputs)
-                else:
-                    self.guess_nonlinear(self._inputs, self._outputs, self._residuals)
-        finally:
-            if complex_step:
-                # Note: passing in False swaps back to the complex vector, which is valid since
-                # the inputs and residuals value cannot be edited.
-                self._inputs.set_complex_step_mode(False)
-                self._inputs._under_complex_step = True
-                self._outputs.set_complex_step_mode(True)
-                self._residuals.set_complex_step_mode(False)
-                self._residuals._under_complex_step = True
-            self._inputs.read_only = self._residuals.read_only = False
+                    # Note: passing in False swaps back to the complex vector, which is valid since
+                    # the inputs and residuals value cannot be edited.
+                    self._inputs.set_complex_step_mode(False)
+                    self._inputs._under_complex_step = True
+                    self._outputs.set_complex_step_mode(True)
+                    self._residuals.set_complex_step_mode(False)
+                    self._residuals._under_complex_step = True
+                self._inputs.read_only = self._residuals.read_only = False
 
     def _apply_linear(self, jac, vec_names, rel_systems, mode, scope_out=None, scope_in=None):
         """