Minor docs and test tweaks.

docs/cpp_objects.rst

@@ -126,7 +126,7 @@ indices)``::
   # Extract full data without "decompressing" ts.
   shape = (len(ts.names), len(ts.times))
   dest = np.empty(shape, dtype=ts.dtype)
-  ts.extract(dest, None, None)
+  ts.extract(dest)
 
   # Extract only data for detector at index 1.
   indices = np.array([1])
@@ -137,6 +137,10 @@ indices)``::
   dest = np.empty((6, len(ts.times)), dtype=ts.dtype)
   ts.extract(dest, np.array([0, 2, 4]), np.array([1, 3, 5]))
 
+  # Extract all dets, samples [100:200].
+  dest = np.empty((len(ts.names), 100), dtype=ts.dtype)
+  ts.extract(dest, None, None, 100, 200)
+
 
 
 How to work with float arrays

test/test_g3super.py

@@ -356,11 +356,14 @@ def _get_ts():
             with self.assertRaises(ValueError):
                 ts.extract(dest)
 
-        ts = _get_ts()
         idx = np.array([2, 1, 3])
         dest = np.zeros((len(idx), 100), dtype='float32')
+        ts = _get_ts()
         ts.extract(dest, None, idx)
         np.testing.assert_array_equal(dest, ts.data[idx])
+        ts = _get_ts()
+        ts.extract(dest, src_indices=idx)
+        np.testing.assert_array_equal(dest, ts.data[idx])
 
         ts = _get_ts()
         dest = np.zeros((1, 2, 100), dtype='float32')
@@ -380,6 +383,11 @@ def _get_ts():
         with self.assertRaises(ValueError):
             ts.extract(dest, None, idx)
 
+        # Sample subset
+        ts = _get_ts()
+        dest = np.zeros((5, 91-10), dtype='float32')
+        ts.extract(dest, start=10, stop=91)
+
         #Injection test.
         ts = _get_ts()
         src_i = np.array([2, 1, 3])