Hi,
I have done a tikzpicture witch is a matrix with nodes :
\begin{figure}[h]
\centering
\begin{tikzpicture}
[auto,
decision/.style={diamond, draw=blue, thick, fill=blue!20,
text width=4.5em, text badly centered,
inner sep=1pt},
block/.style ={rectangle, draw=blue, thick, fill=blue!20,
text ...