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

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