I installed R-programing and I found that R-programing is very useful in case Gretl has some problems in programing such as date and strings treatment. But R-programing is not easy to find syntax, therefore I collect all available syntax in one text file from the following websites. I think R-programing is a very good supply to Gretl programing. I found also through Gretl can run R-programing. R-programing is useful to treat image analysis. My question is how to start R-programing through Gretl. I tried to start gnu r but I failed to started it. The following website have R-programing syntax: http://cran.r-project.org/doc/contrib/Seefeld_StatsRBio.pdf http://en.wikipedia.org/wiki/R_programming_language Best regards and keep in touch Nabil Brandl <http://nabilnabil.homestead.com/> http://nabilnabil.homestead.com