triu
====

upper triangle



Description
~~~~~~~~~~~

Upper triangle. See tril.



Examples
~~~~~~~~


::

    s=`poly`_(0,'s');
    triu([s,s;s,1])
    triu([1/s,1/s;1/s,1])




See Also
~~~~~~~~


+ `tril`_ lower triangular part of matrix
+ `ones`_ matrix made of ones
+ `eye`_ identity matrix
+ `diag`_ diagonal including or extracting


.. _ones: ones.html
.. _tril: tril.html
.. _eye: eye.html
.. _diag: diag.html