Fixed bug with dl.freedist

`dl.freedist` added to the documentaion but hidden from the other models in API references.

Author: HKaras

deerlab/__init__.py

@@ -11,6 +11,7 @@ def __getattr__(name):
         return _bg_models_mod.__getattr__(name)
     raise AttributeError(f"module 'deerlab' has no attribute {name!r}")
 
+from .dd_models import freedist
 from .model import Model, Penalty, Parameter, link, lincombine, merge, relate
 from .deerload import deerload
 from .selregparam import selregparam

deerlab/dd_models.py

@@ -135,6 +135,19 @@ def _multirice3dfun(r,nu,sig):
 # =================================================================
 
 def freedist(r):
+    """General Non-parametric distribution model, seldom needed by the user.
+    Used when creating a model that is a linear combination of two parameter-free models 
+    
+    Parameters
+    ----------
+    r : array_like
+        Distance axis, in nanometers.
+    
+    Returns
+    -------
+    Model
+    
+    """
     def _nonparametric():
         return np.eye(len(r))
     # Create model

docsrc/source/reference.rst

@@ -85,3 +85,4 @@ Reference Index
     der_snr
     formatted_table
     show_config
+    freedist