Merge pull request #2068 from janezd/fix-distribution-discretize-meta

[FIX] OWDistributions: Fix binning of meta attributes

Author: lanzagar

Orange/widgets/visualize/owdistributions.py

@@ -287,10 +287,12 @@ def _setup(self):
         if self.var is None:
             return
         if self.disc_cont:
-            data = self.data[:, (self.var, self.cvar) if self.cvar else self.var ]
+            domain = Orange.data.Domain(
+                [self.var, self.cvar] if self.cvar else [self.var])
+            data = Orange.data.Table(domain, data)
             disc = Orange.preprocess.discretize.EqualWidth(n=self.bins[self.smoothing_index])
             data = Orange.preprocess.Discretize(method=disc, remove_const=False)(data)
-            self.var = (list(data.domain) + list(data.domain.metas))[0]
+            self.var = data.domain[0]
         self.set_left_axis_name()
         self.enable_disable_rel_freq()
         if self.cvar:

Orange/widgets/visualize/tests/test_owdistributions.py

@@ -1,7 +1,7 @@
 # Test methods with long descriptive names can omit docstrings
 # pylint: disable=missing-docstring
 
-from Orange.data import Table
+from Orange.data import Table, Domain, DiscreteVariable
 from Orange.data.table import dataset_dirs
 from Orange.tests import test_dirname
 from Orange.widgets.tests.base import WidgetTest
@@ -43,3 +43,17 @@ def test_remove_data(self):
         self.send_signal("Data", None)
         self.assertEqual(self.widget.cb_prob.count(), 0)
         self.assertEqual(self.widget.groupvarview.count(), 0)
+
+    def test_discretize_meta(self):
+        """The widget discretizes continuous meta attributes"""
+        domain = self.iris.domain
+        mdomain = Domain(domain.attributes[:-1], domain.class_var,
+                         metas=domain.attributes[-1:])
+        miris = Table(mdomain, self.iris)
+        self.send_signal("Data", miris)
+        widget = self.widget
+        widget.disc_cont = True
+        widget.varview.selectionModel().select(
+            widget.varview.model().index(4, 0))
+        self.assertIsInstance(widget.var, DiscreteVariable)
+        self.assertEqual(widget.var.name, mdomain.metas[0].name)