Converts background function to python

Author: DrPaulSharp

RATapi/examples/non_polarised/DSPC_function_background.py

@@ -145,8 +145,8 @@ def DSPC_function_background():
     # FIXME: replace this with a Python custom file when Python backgrounds are added!
     problem.custom_files.append(
         name="D2O Background Function",
-        filename="backgroundFunction.m",
-        language="matlab",
+        filename="backgroundFunction.py",
+        language="python",
         path=pathlib.Path(__file__).parent.resolve(),
     )
 

RATapi/examples/non_polarised/backgroundFunction.m

@@ -8,8 +8,6 @@ def backgroundFunction(xdata, params):
     back_const = params[2]
 
     # Make an exponential decay background
-    background = np.zeros(len(xdata))
-    for i in range(0, len(xdata)):
-        background[i] = Ao * np.exp(-k * xdata[i]) + back_const
+    background = Ao * np.exp(-k * np.array(xdata)) + back_const
 
     return background