Add lambda_max to init

Author: RichardWaiteSTFC

scripts/Engineering/pawley_utils.py

@@ -290,9 +290,9 @@ def undo_fit(self):
 
 
 class PawleyPattern2D(PawleyPattern1D):
-    def __init__(self, *args, global_scale: bool = True, **kwargs):
+    def __init__(self, *args, global_scale: bool = True, lambda_max: float = 5.0, **kwargs):
         super().__init__(*args, **kwargs)
-        self.lambda_max = 5.0  # same default as PoldiAutoCorrelation
+        self.lambda_max = lambda_max
         self.scales = None
         self.bgs = None
         self.set_global_scale(global_scale)

scripts/test/Engineering/test_pawley_utils.py

@@ -203,7 +203,7 @@ def test_eval_resids_global_scale_true(self):
         self.assertAlmostEqual(sum(resids), -5e7, delta=1e7)
 
     def test_eval2D_respects_lambda_max(self):
-        pawley = PawleyPattern2D(self.ws, [self.phase], global_scale=True, profile=GaussianProfile())
+        pawley = PawleyPattern2D(self.ws, [self.phase], global_scale=True, lambda_max=5.0, profile=GaussianProfile())
         ysum = pawley.eval_2d(pawley.get_free_params()).extractY().sum()
         pawley.lambda_max = 2.0
         ysum_cropped = pawley.eval_2d(pawley.get_free_params()).extractY().sum()