[Gretl-users] Boolean and / or in if-condtion (for example)

Dear list members, I know my post is a consequence of my very modest programming skills, however, I think, others users might encounter this problem as well. I was trying to set up an if-command: if [condtion 1] = True and [condition 2] = True than do stuff endif In the first place, I used 'and' literally - I have to admit, that my first experience with if-conditions are from Excel-VBA. This of course produced an error-message. It took me while to figure out the solution. I remembered an R-tutorial which dealt with Boolean operators when I read the following post: http://lists.wfu.edu/pipermail/gretl-devel/2007-December/000714.html And most likely, my fault was to use the wrong operator 'and' instead of '&&'. Maybe I have missed it in the user guide, but it might be helpful, to put in a table that deals with logical operators &&, !, ||,etc. like true && true is true !true && false is true Maybe this is clear to anyone else, than you can of course disregard my post. Best regards Jan