[Gretl-users] operate on all variables

Hello. I'm new to gretl and I'm trying to create a simple script that will, for instance, seasonally adjust all variables. And I've run into troubles. So... 1. how do I generate variable *variable names* to genr? for instance, I want to call each detrended variable "sa_" & the original variable name 2. how do I pass the parameter to deseas()? deseas(gdp) works fine, but deseas(varname(4)) doesn't (assuming varname(4)="gdp", varname returns a string and deseas doesn't work that way. I also tried looping through a list of all the variables, but the same error of erroneous argument type is brought up by deseas(). Thanks!! PC