Minor string formatting in parmest.py and test_parmest.py

Author: slilonfe5

pyomo/contrib/parmest/parmest.py

@@ -161,6 +161,13 @@ def _build_meas_error_covariance(model, estimated_var=None):
     """
     Builds the full measurement-error covariance matrix
 
+    Note: The code does not automatically build the full covariance matrix
+    It only places whatever covariances the user explicitly supplies
+    The leading-diagonal elements can be constructed automatically or
+    from user-supplied values
+    Therefore, for correlation in time, shared timepoints, or other types of
+    correlation, the user must provide all the desired covariance terms
+
     Parameters
     ----------
     model : ConcreteModel

pyomo/contrib/parmest/tests/test_parmest.py

@@ -1464,11 +1464,11 @@ def test_incorrect_error_covariance_exception(self):
 
         obj3, theta3 = pest3.theta_est()
         with pytest.raises(
-                KeyError,
-                match='One or more experiment outputs are not defined in the '
-                '"measurement_error" attribute. All the variables defined '
-                'in "experiment_outputs" must be defined as keys in '
-                '"measurement_error".',
+            KeyError,
+            match='One or more experiment outputs are not defined in the '
+            '"measurement_error" attribute. All the variables defined '
+            'in "experiment_outputs" must be defined as keys in '
+            '"measurement_error".',
         ):
             pest3.cov_est()
 
@@ -1478,9 +1478,9 @@ def test_incorrect_error_covariance_exception(self):
         with pytest.raises(
             KeyError,
             match='One or more experiment outputs are not defined in the '
-                  '"measurement_error" attribute. All the variables defined '
-                  'in "experiment_outputs" must be defined as keys in '
-                  '"measurement_error".',
+            '"measurement_error" attribute. All the variables defined '
+            'in "experiment_outputs" must be defined as keys in '
+            '"measurement_error".',
         ):
             obj4, theta4 = pest4.theta_est()