fix init

Author: GiovanniCanali

pina/domain/base_domain.py

@@ -19,22 +19,32 @@ class BaseDomain(DomainInterface, metaclass=ABCMeta):
     # Define available sampling modes
     __AVAILABLE_MODES = ("random", "grid", "lh", "chebyshev", "latin")
 
-    def __init__(self, domain_dict):
+    def __init__(self, domain_dict=None):
         """
         Initialization of the :class:`BaseDomain` class.
 
-        :param dict domain_dict: A dictionary where the keys are the variable
+        :param domain_dict: A dictionary where the keys are the variable
             names and the values are the domain extrema. The domain extrema can
             be either a list or tuple with two elements or a single number. If
             the domain extrema is a single number, the variable is fixed to that
             value.
+        :type domain_dict: dict | None
         :raises TypeError: If the domain dictionary is not a dictionary.
         :raises ValueError: If the domain dictionary is empty.
         :raises ValueError: If the domain dictionary contains variables with
             invalid ranges.
         :raises ValueError: If the domain dictionary contains values that are
             neither numbers nor lists/tuples of numbers of length 2.
         """
+        # Initialize fixed and ranged variables
+        self._fixed = {}
+        self._range = {}
+        invalid = []
+
+        # Skip checks if domain_dict is None -- SimplexDomain case
+        if domain_dict is None:
+            return
+
         # Check domain_dict is a dictionary
         if not isinstance(domain_dict, dict):
             raise TypeError(
@@ -51,11 +61,6 @@ def __init__(self, domain_dict):
         for v in domain_dict.values():
             check_consistency(v, (int, float))
 
-        # Store
-        self._fixed = {}
-        self._range = {}
-        invalid = []
-
         # Iterate over domain_dict items
         for k, v in domain_dict.items():
 

pina/domain/simplex_domain.py

@@ -38,6 +38,8 @@ def __init__(self, simplex_matrix, sample_surface=False):
         :raises ValueError: If the number of vertices is not equal to the
             dimension of the simplex plus one.
         """
+        super().__init__()
+
         # Initialization
         self.sample_modes = ["random"]
         self.sample_surface = sample_surface