.. _noop:

================================================================================
No operation
================================================================================

.. versionadded:: 6.1.0

Pass a coordinate through unchanged.

+---------------------+--------------------------------------------------------+
| **Alias**           | noop                                                   |
+---------------------+--------------------------------------------------------+
| **Domain**          | 4D                                                     |
+---------------------+--------------------------------------------------------+
| **Input type**      | Any                                                    |
+---------------------+--------------------------------------------------------+
| **Output type**     | Any                                                    |
+---------------------+--------------------------------------------------------+

The no operation is a dummy operation that returns whatever is passed to it
as seen in this example::

    $ echo 12 34 56 78 | cct +proj=noop
      12.0000        34.0000       56.0000       78.0000

The operation has no options and default options will not affect the output.