[Scipy-svn] r5056 - in trunk/scipy/interpolate: . tests

scipy-svn@scip... scipy-svn@scip...
Mon Nov 10 17:03:52 CST 2008


Author: ptvirtan
Date: 2008-11-10 17:03:38 -0600 (Mon, 10 Nov 2008)
New Revision: 5056

Modified:
   trunk/scipy/interpolate/interpolate.py
   trunk/scipy/interpolate/tests/test_interpolate.py
Log:
Ensure interp1d.__call__ always returns an ndarray, not an array scalar, for 0-dim output.

Modified: trunk/scipy/interpolate/interpolate.py
===================================================================
--- trunk/scipy/interpolate/interpolate.py	2008-11-10 22:50:30 UTC (rev 5055)
+++ trunk/scipy/interpolate/interpolate.py	2008-11-10 23:03:38 UTC (rev 5056)
@@ -295,7 +295,7 @@
 
         Returns
         -------
-        y_new : number or array
+        y_new : ndarray
             Interpolated value(s) corresponding to x_new.
 
         """
@@ -323,10 +323,10 @@
             # special case: x is a scalar
             if out_of_bounds:
                 if ny == 0:
-                    return self.fill_value
+                    return asarray(self.fill_value)
                 else:
                     y_new[...] = self.fill_value
-            return y_new
+            return asarray(y_new)
         elif self._kind == 'linear':
             y_new[..., out_of_bounds] = self.fill_value
             axes = range(ny - nx)

Modified: trunk/scipy/interpolate/tests/test_interpolate.py
===================================================================
--- trunk/scipy/interpolate/tests/test_interpolate.py	2008-11-10 22:50:30 UTC (rev 5055)
+++ trunk/scipy/interpolate/tests/test_interpolate.py	2008-11-10 23:03:38 UTC (rev 5056)
@@ -186,6 +186,7 @@
     def _nd_check(self, kind='linear'):
         """ Check the behavior when the inputs and outputs are multidimensional.
         """
+
         # Multidimensional input.
         interp10 = interp1d(self.x10, self.y10, kind=kind)
         assert_array_almost_equal(
@@ -193,6 +194,10 @@
             np.array([[3.4, 5.6], [2.4, 7.8]]),
         )
 
+        # Scalar input -> 0-dim scalar array output
+        self.failUnless(isinstance(interp10(1.2), np.ndarray))
+        assert_equal(interp10(1.2).shape, ())
+
         # Multidimensional outputs.
         interp210 = interp1d(self.x10, self.y210, kind=kind)
         assert_array_almost_equal(



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