[Gretl-users] low to high frequency simply by repeating values

Hi, my seemingly simple problem is this: in a quarterly dataset I have a series where valid values are only given for the respective first quarters, something like this: a NA NA NA b NA NA NA c .... I want to repeat and copy those values (a,b,c...) over to the other quarters of the respective years and fill the NAs with that. (So annual values are simply distributed over the quarters by repitition.) However, I'm struggling to get the tdisagg() function to do that. Yes, I have read the corresponding chapter 9 of the guide. Any hints or examples will be appreciated. I would prefer to do this via scripting, not via the GUI, to automate it later. thanks sven