BUG(axes): Make concat out param work (#454)

pysindy/utils/axes.py

@@ -117,13 +117,16 @@ def decorator(func):
 
 
 @implements(np.concatenate)
-def concatenate(arrays, axis=0):
+def concatenate(arrays, axis=0, out=None, dtype=None, casting="same_kind"):
     parents = [np.asarray(obj) for obj in arrays]
     ax_list = [obj.__dict__ for obj in arrays if isinstance(obj, AxesArray)]
     for ax1, ax2 in zip(ax_list[:-1], ax_list[1:]):
         if ax1 != ax2:
             raise TypeError("Concatenating >1 AxesArray with incompatible axes")
-    return AxesArray(np.concatenate(parents, axis), axes=ax_list[0])
+    result = np.concatenate(parents, axis, out=out, dtype=dtype, casting=casting)
+    if isinstance(out, AxesArray):
+        out.__dict__ = ax_list[0]
+    return AxesArray(result, axes=ax_list[0])
 
 
 def comprehend_axes(x):

test/utils/test_axes.py

@@ -7,6 +7,13 @@
 from pysindy import AxesArray
 
 
+def test_concat_out():
+    arr = AxesArray(np.arange(3).reshape(1, 3), {"ax_a": 0, "ax_b": 1})
+    arr_out = np.empty((2, 3)).view(AxesArray)
+    result = np.concatenate((arr, arr), axis=0, out=arr_out)
+    assert_equal(result, arr_out)
+
+
 def test_reduce_mean_noinf_recursion():
     arr = AxesArray(np.array([[1]]), {})
     np.mean(arr, axis=0)