refactor: rename singular_values to _singular_values

Author: dsj976

pydmd/bopdmd.py

@@ -1570,7 +1570,7 @@ def fit_econ(self, s, V, t):
         self._b = self.operator.compute_operator(snp.T, self._time)
 
         # Store the singular values
-        self.singular_values = s
+        self._singular_values = s
 
         return self
 

pydmd/plotter.py

@@ -788,7 +788,7 @@ def plot_summary(
         s = np.linalg.svd(snp, full_matrices=False, compute_uv=False)
     else:
         try:
-            s = dmd.singular_values
+            s = dmd._singular_values
         except AttributeError as e:
             msg = "Snapshots and singular values are not available."
             raise ValueError(msg) from e