Parameters can be changed on copying.

src/tirl/interpolators/interpolator.py

@@ -68,7 +68,8 @@ class Interpolator(TIRLObject):
     # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INITIALISATION ~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
 
     def __init__(self, source, tensor_axes=(), radius=1, hold=False,
-                 threads=-1, verbose=False, ipkwargs=None, **kwargs):
+                 threads=-1, verbose=False, ipkwargs=None, fill_value=None,
+                 **kwargs):
         """
         Initialisation of Interpolator.
 
@@ -116,6 +117,10 @@ class Interpolator(TIRLObject):
 
         # Initialise metaparameters
         self.kwargs = kwargs
+        if fill_value is None:
+            self.kwargs.update(fill_value=ts.FILL_VALUE)
+        else:
+            self.kwargs.update(fill_value=fill_value)
 
         # Set interpolation source values
 
@@ -487,7 +492,7 @@ class Interpolator(TIRLObject):
         else:
             return True
 
-    def copy(self):
+    def copy(self, **newparams):
         """
         Copy constructor. Subclasses that define their constructor signature
         differently MAY find it necessary to overload this constructor as well.
@@ -498,10 +503,11 @@ class Interpolator(TIRLObject):
         """
         kwargs = {k: v for k, v in self.kwargs.items()
                   if k not in self.RESERVED_KWARGS}
-        obj = type(self)(
-            source=self.values, tensor_axes=self.tensor_axes,
+        kw = dict(source=self.values, tensor_axes=self.tensor_axes,
             radius=self.radius, hold=self.hold, threads=self.threads,
             verbose=self.verbose, ipkwargs=self.ipkwargs, **kwargs)
+        kw.update(newparams)
+        obj = type(self)(**kw)
         return obj
 
     @classmethod