PlotSparse
==========

plot the pattern of non nul elements of a sparse matrix



Calling Sequence
~~~~~~~~~~~~~~~~


::

    PlotSparse(A [,style])




Arguments
~~~~~~~~~

:A a sparse matrix
: :style (optional) a string given the color and/or the marker type of
the form "[color][mark]" where color may be a number referring the
color you want to use (in the current colormap). If you use the std
colormap then color may be one of the following letters :

::

    k  for `black`_       b  for blue
    r  for red         g  for green
    c  for cyan        m  for magenta
    y  for yellow      t  for turquoise
    G  a dark green

mark must be one of the following :

::

    .  point           +  plus 
    x  cross           *  circled plus 
    D  filled diamond  d  diamond
    ^  upper triangle  v  down triangle
    o  circle

by default you have "b." (in fact the 2d color) and this is also
  forced in case of error.
:



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

plot the pattern of non nul elements of a sparse matrix : each non nul
element is drawn with a marker. For "big" matrix use essentially the
point . as marker



Examples
~~~~~~~~


::

    [A,description,ref,mtype] = `ReadHBSparse`_(SCI+"/modules/umfpack/examples/arc130.rua");
    PlotSparse(A,"y+")
    `xtitle`_(ref + "." + mtype + " : " + description)




See Also
~~~~~~~~


+ `ReadHBSparse`_ read a Harwell-Boeing sparse format file


.. _ReadHBSparse: ReadHBSparse.html