.. highlightlang:: us

.. _isstring:

isstring
========

.. index:: isstring

.. us.tag  isstring ENGLISH

:ref:`isstring` checks if its argument is
a string or a string matrix.

.. function::  bool = isstring(m)

.. us.return

**Return Value**

*bool* is TRUE (1), if the argument is a string or string
matrix and FALSE (0), if the argument is of another type.

.. us.params

**Parameters**

.. uparam:: m

   *m* is a scalar, matrix or function.

.. us.example

**Example**

::

   a = "Hallo"
   isstring(a)
        1.0000
   isstring(sin)
        0.0000
   isstring(1)
        0.0000
   isstring(123)
        0.0000

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`type`,
   :ref:`isreal`,
   :ref:`iscomplex`,
   :ref:`ismatrix`

:sub:`id-1500171`