How to create a stand alone eps file by using pstricks

• In normal latex environment, pstricks works great. But, when I want to do this with pdflatex environment, it does not work. Then I decide to create eps file.
• make one stand alone TeX file
  

  \documentclass{article}
  \usepackage{pstricks,pst-node}
  \usepackage{pst-eps}
  
  \pagestyle{empty}
  \begin{document}
  \begin{psmatrix}[mnode=r,colsep=0.4,rowsep=0.4] 
  
  ..................................................................
  
  \end{psmatrix}
  \end{document}
  

• latex filename.tex
• dvips -E -o target_filename.eps  filename.dvi
  This eps file has the wrong bounding box information, thus one must correct it.
  
• gs -sDEVICE=bbox -dNOPAUSE -dBATCH target_filename.eps
  will return the information about a correct bounding box.
  

  GPL Ghostscript 8.50 (2005-12-31)
  Copyright (C) 2005 artofcode LLC, Benicia, CA.  All rights reserved.
  This software comes with NO WARRANTY: see the file PUBLIC for details.
  %%BoundingBox: 139 308 496 682
  %%HiResBoundingBox: 139.092535 308.049248 495.827985 681.485534
  
  

• emacs target_filename.eps, replace %%BoundingBox information with the above return values, and save the file.