Hello everyone, first of all, thank you a lot for that great piece of software! Now, I have some questions regarding the use of loops in gretl. I have some many datasets in one gretl file like x1 y1 x2 y2 x3 y3 ... x80 y80, where x-y stands for a pair of variables such that e.g. x1 is the independent, explanatory variable of y1, x2 explains y2 and so on. 1. First, I would like to run in a script a simple regression like: loop i=1..80 ols $i+1 const $i endloop where $i+1 should be replaced in the loop with the variable y1 and $i with x1. Obviously, this is not working. I tried many different possibilities, but i did not found a solution. My problem: the variables are not really named like x1, y1 ..., so i can simply copy the example 9.5 in the user guide (May 2007) on page 55, but i need a way to access the variables by its id number and not the name. How can i do this? 2. Is it possible to run in a loop smth like loop i=1..80 gnuplot $i endloop If I try this, he complains that the command gnuplot is not available in loop mode. This brings me to my last question: Why are some commands not available in loop mode? This behaviour was somehow surprising for me. Thanks, Johannes.