Merge pull request #12285 from seibert/take_perf

ENH: array does not need to be writable to use as input to take

2 files changed, 6 insertions, 1 deletions

diff --git a/doc/release/1.16.0-notes.rst b/doc/release/1.16.0-notes.rst
index a0613f61d..a5aa78740 100644
--- a/doc/release/1.16.0-notes.rst
+++ b/doc/release/1.16.0-notes.rst
@@ -262,6 +262,11 @@ copying the data directly into the appropriate slice of the resulting array.
 This results in significant speedups for these large arrays, particularly for
 arrays being blocked along more than 2 dimensions.
 
+Speedup ``np.take`` for read-only arrays
+----------------------------------------
+The implementation of ``np.take`` no longer makes an unnecessary copy of the
+source array when its ``writeable`` flag is set to ``False``.
+
 
 Changes
 =======
diff --git a/numpy/core/src/multiarray/item_selection.c b/numpy/core/src/multiarray/item_selection.c
index de54ca1b3..a7c6b14f4 100644
--- a/numpy/core/src/multiarray/item_selection.c
+++ b/numpy/core/src/multiarray/item_selection.c
@@ -45,7 +45,7 @@ PyArray_TakeFrom(PyArrayObject *self0, PyObject *indices0, int axis,
 
     indices = NULL;
     self = (PyArrayObject *)PyArray_CheckAxis(self0, &axis,
-                                    NPY_ARRAY_CARRAY);
+                                    NPY_ARRAY_CARRAY_RO);
     if (self == NULL) {
         return NULL;
     }