.. highlightlang:: us

.. _ST_intersectioni:

ST_intersectioni
================

.. index:: ST_intersectioni

.. us.tag  ST_intersectioni NOTREADYENGLISH STR New5708

Find the set intersection of two vectors and returns an index vector
with the positions in *a*. (All the elements that are in *a* and *b*) 

.. function::  c = ST_intersectioni(a, b)

.. us.return

**Return Value**

*c*is an index vector with the intersection of *a* and *b*. If an intersection
doesn't exist the functions returns 0.

.. us.params

**Parameters**

.. uparam:: a

   *a* is a string or real matrix.

.. uparam:: b

   *b* is a string or real matrix.

.. us.example

**Example**

::

   * ST_intersectioni([2.1,3.3,5,4.1,7], [2.1,4.1,9])
      1.000    4.000
   *
   * ST_intersectioni(["one", "two", "three"], ["two", "four", "five"])
      2.000

.. seealso::
   :ref:`overview-strings`,
   :ref:`ST_complement`,
   :ref:`ST_set`,
   :ref:`ST_seti`,
   :ref:`ST_union`,
   :ref:`ST_intersection`,
   :ref:`find`

:sub:`id-1607093`