change doc for indices and remove the unnecessarily tolist() operation

skimage/feature/peak.py

@@ -33,8 +33,8 @@ def peak_local_max(image, min_distance=10, threshold_abs=0, threshold_rel=0.1,
         If True, `min_distance` excludes peaks from the border of the image as
         well as from each other.
     indices : bool
-        If True, the output will be a matrix representing peak coordinates.
-        If False, the output will be a boolean matrix shaped as `image.shape`
+        If True, the output will be an array representing peak coordinates.
+        If False, the output will be a boolean array shaped as `image.shape`
         with peaks present at True elements.
     num_peaks : int
         Maximum number of peaks. When the number of peaks exceeds `num_peaks`,
@@ -150,6 +150,6 @@ def peak_local_max(image, min_distance=10, threshold_abs=0, threshold_rel=0.1,
     if indices is True:
         return coordinates
     else:
-        nd_indices = tuple(coordinates.T.tolist())
+        nd_indices = tuple(coordinates.T)
         out[nd_indices] = True
         return out

skimage/feature/tests/test_peak.py

@@ -116,12 +116,13 @@ def test_indices_with_labels():
                                  indices=True, exclude_border=False)
     assert (result == np.transpose(expected.nonzero())).all()
 
+
 def test_ndarray_indices_false():
     nd_image = np.zeros((5,5,5))
     nd_image[2,2,2] = 1
     peaks = peak.peak_local_max(nd_image, min_distance=1, indices=False)
     assert (peaks == nd_image.astype(np.bool)).all()
-    
+
 
 if __name__ == '__main__':
     from numpy import testing