[pstricks] why this code does not compile

[Herbert Voss]

Am 08.04.2012 13:05, schrieb Marc GRILLET:
> So, I don't understand why OK.tex compiles without any problem and why
> pasOK.tex doesn't. The only difference, as you'll see is "=true" after
> algebraic.

your PSTricks files are out of date. Put \listfiles
into your documents and compare with the file dates of current
TeXLive 2011:

  *File List*
  article.cls    2007/10/19 v1.4h Standard LaTeX document class
   size11.clo    2007/10/19 v1.4h Standard LaTeX file (size option)
pstricks-add.sty    2010/02/11 v. 0.14 package wrapper for 
pstricks-add.tex (hv
)
pstricks.sty    2011/10/31 v0.52 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex    2012/03/11 v2.27 `PSTricks' (tvz,hv)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
  xkeyval.sty    2008/08/13 v2.6a package option processing (HA)
  xkeyval.tex    2008/08/13 v2.6a key=value parser (HA)
   pst-fp.tex    2012/03/11 v2.27 `PST-fp' (hv)
pstricks.pro    2011/10/31 v. 1.08, PostScript prologue file (hv)
pst-algparser.pro    2011/10/31 v. 0.04, PostScript prologue file (hv)
pst-tools.pro    2012/01/01 v. 0.02, PostScript prologue file (hv)
pst-dots.pro    2006/12/19 v. 2.00, PostScript prologue file (hv)
   xcolor.sty    2007/01/21 v2.11 LaTeX color extensions (UK)
    color.cfg    2007/01/18 v1.5 color configuration of teTeX/TeXLive
    dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pst-plot.sty    2011/04/13 package wrapper for pst-plot.tex (hv)
pst-xkey.sty    2005/11/25 v1.6 package wrapper for pst-xkey.tex (HA)
  multido.sty    2004/05/17 package wrapper for PSTricks `multido.tex', 
(HV/RN)
  multido.tex    2010/05/14 v1.42 `multido' (tvz,hv)
pst-plot.tex    2012/03/14 1.40 `pst-plot' (tvz,hv)
pst-node.sty    2010/04/22 package wrapper for pst-node.tex
pst-node.tex    2012/02/12 1.22 `pst-node' (tvz)
pst-node.pro    2010/04/30 v. 1.12, PostScript prologue file (hv)
   pst-3d.sty    2009/07/28 package wrapper for pst-3d.tex (hv)
   pst-3d.tex    2010/02/14 v1.11 `PST-3d' (hv)
   pst-3d.pro    2010/01/01 v. 0.01, PostScript prologue file (hv)
pst-math.sty    2009/01/20 package wrapper for PSTricks pst-math.tex
pst-math.pro    2010/10/02 v. 0.61, PostScript prologue file (hv)
pstricks-add.tex    2011/12/20 v3.57 `PSTricks-add' (hv)
pstricks-add.pro    2009/12/17 v. 0.23, PostScript prologue file (hv)
pstricks-add.cfg    2005/01/10 v0.1 addtional user stuff (hv)
  ***********

your Debian TeXLive is from 2009, a really old one.

Herbert