Merge pull request #5828 from lanzagar/fix_lda

[FIX] Linear Projection: Fix LDA

Author: VesnaT

Orange/widgets/visualize/owlinearprojection.py

@@ -329,7 +329,10 @@ def effective_variables(self):
 
     @property
     def effective_data(self):
-        return self.data.transform(Domain(self.effective_variables))
+        cvs = None
+        if self.placement == Placement.LDA:
+            cvs = self.data.domain.class_vars
+        return self.data.transform(Domain(self.effective_variables, cvs))
 
     def __vizrank_set_attrs(self, attrs):
         if not attrs:

Orange/widgets/visualize/tests/test_owlinearprojection.py

@@ -85,6 +85,8 @@ def test_no_data_for_lda(self):
         self.send_signal(self.widget.Inputs.data, self.data)
         self.widget.radio_placement.buttons[Placement.LDA].click()
         self.assertTrue(buttons[Placement.LDA].isEnabled())
+        output = self.get_output(self.widget.Outputs.components)
+        self.assertTrue(output and len(output) == 2)
         self.send_signal(self.widget.Inputs.data, Table("housing"))
         self.assertFalse(buttons[Placement.LDA].isEnabled())
         self.send_signal(self.widget.Inputs.data, None)

Orange/widgets/visualize/utils/widget.py

@@ -455,7 +455,10 @@ def set_data(self, data):
         self.openContext(self.data)
         self._invalidated = not (
             data_existed and self.data is not None and
-            array_equal(effective_data.X, self.effective_data.X))
+            array_equal(effective_data.X, self.effective_data.X) and
+            array_equal(effective_data.Y, self.effective_data.Y) and
+            array_equal(effective_data.metas, self.effective_data.metas)
+        )
         self._domain_invalidated = not (
             data_existed and self.data is not None and
             effective_data.domain.checksum()