Dear Sirs Tanks a lot for the context software. I use it so much. I'm a physics/chemistry teacher and for making personalized exams with random numbers/questions the math.random() from lua is great. For draw schematic diagrams/graphs with random arguments I use tikz inside luacode, like context("\\addplot[blue, ultra thick] {"..slope.."*x-"..workfunction.."};"). However, it would be useful to use some pstricks packages. For example, the package pst-spectra includes a set of spectrum of various chemical elements. It is unique. Currently, I run latex and then import the pdf file into context file. There are other old pstricks macros, but still very useful, that i like to use. It's old, but useful. In the pstricks home page (http://tug.org/PSTricks/main.cgi/) I can found some new work, with some new packages and macros. For now, if i try to run this simple code \usemodule[pstric] \starttext \startPSTRICKS \pspicture(0,0)(20,20) \psline(0,0)(20,20) \psline(1,1)(10,10) \endpspicture \stopPSTRICKS \stoptext I found this error message: [...] (/usr/local/texlive/2013/texmf-dist/tex/generic/pgf/utilities/pgffor.code.tex) `PSTricks' v2.43 <2013/05/12> (tvz) (/usr/local/texlive/2013/texmf-dist/tex/generic/pstricks/pstricks.con)) (/usr/local/texlive/2013/texmf-dist/tex/generic/pst-plot/pst-plot.tex v1.45, 2013/04/29 (tvz,hv) ! Undefined control sequence. \special@length ...ecial@length]{ #1|#2|#3 }\ifx! #1\relax \edef \pst@Specia... \pssetlength ...ecial@length \pst@tempg \@nil {#1} \ignorespaces \pst@getlength #1#2->\pssetlength \pst@dimg {#1} \edef #2{\pst@number\pst@di. .. <argument> ...endcsname \expandafter {\XKV@tempa } \relax \XKV@srstate{}{@\r... \XKV@afterfi #1\fi ->\fi #1 \XKV@f@r ...nnil \expandafter \@gobbletwo \else #2 \expandafter \XKV@f@r \fi ... ... l.219 \psset[pst-plot]{barwidth=0.25cm} Thanks a lot for your support and for Context. Jorge Manuel