[pstricks] Vertical \ncarcbox in \psmatrix

[Arne Hallam]

I am wanting to demonstrate how to construct submatrices and am doing fine 
with horizontal boxes to show row inclusion but get a circle around the 
first vertical node instead of a vertical box.

\documentclass{report}
\usepackage{pstricks,pst-plot}
\usepackage{pst-node}
\usepackage{amsmath}
\SpecialCoor
\begin{document}

\begin{equation}
A(\{1,3\},\{1,3\})~=~\left(\raisebox{-3.0ex}{
\begin{psmatrix}[rowsep=3pt,colsep=10pt]
3 &4&7 \\
2&5& 2 \\
1&0&4
\end{psmatrix}} \right)
\ncarcbox[nodesep=.1,boxsize=.25,linearc=0,linestyle=dashed,linecolor=green]{1,3}{3,3}
\ncarcbox[nodesep=.15,boxsize=.25,linearc=0,arcangle=0.001, 
linestyle=dashed,linecolor=blue]{1,1}{1,3}
\ncarcbox[nodesep=.15,boxsize=.25,linearc=0,arcangle=0.001,linestyle=dashed,linecolor=blue]{3,1}{3,3}
\end{equation}


\end{document}