Dear Sir: I am interesting in to call function "cor" from C code. The reason for this, is that I need to obtain a matrix of correlation in a C program, and I have think to link my program in C code with R. But I don?t know make this link. I have read R-exts.pdf document, but I have not found a direct way to link. But I have a problem which I have not found information in R documentation, for that I ask for help. Thanking you in advance, Mario Lara Yuste malayus at hotmail.com University of Cordoba (Spain) _________________________________________________________________ Reparaciones, servicios a domicilio, empresas, profesionales... Todo en la gu?a telef?nica de QDQ. http://qdq.msn.es/msn.cfm