[This is probably OT, sorry] Am 19.05.2016 um 19:06 schrieb Summers, Peter: I find it strange to combine the 'foreach' loop with the numerical indexing into the list. I would have expected either the following: loop i=1..nelem(ylist) ... ylist[i] or this variant: loop foreach i ylist ... $i But as I said, this is OT and probably not changing your results. cheers, sven

On Thu, 19 May 2016, Summers, Peter wrote: It looks as if the two variants ought to give the same results. I'm on limited computer-time at the moment but this is on my list of things to look into when I get a chance. Allin

Thanks as always, Allin! This works as expected now. PS From: gretl-users-bounces(a)lists.wfu.edu [mailto:gretl-users-bounces@lists.wfu.edu] On Behalf Of Cottrell, Allin Sent: Tuesday, June 14, 2016 9:17 AM To: Gretl list Subject: Re: [Gretl-users] odd behavior of "diff" On Thu, May 19, 2016 at 6:06 PM, Summers, Peter <psummers@highpoint.edu<mailto:psummers@highpoint.edu>> wrote: Dear all, I’ve run across something strange when using diff() in a loop. Given a series with missing values, Gretl seems to be “recycling” values from the previous loop iteration. The following script illustrates the problem: on the second loop iteration, the series “r” should be missing for the first half of the sample but instead the values from the first loop iteration are printed. Doing the same thing “by hand” after the loop produces what I’d expect. Is this intended? <hansl> nulldata 104 setobs 52 2006-01-03 series y1 = uniform() series y2 = uniform()*(obs>obsnum(2006-07-04)) y2 = zeromiss(y2) # y2 is missing for first half list ylist = y1 y2 loop foreach i ylist --quiet r = 100*diff(log(ylist[i])) print ylist[i] r --byobs endloop r1 = 100*diff(log(y1)) r2 = 100*diff(log(y2)) print r1 r2 --byobs </hansl> ​Sorry it has taken me a while to get to this, but I've now figured out what was going wrong, and it's fixed in git and snapshots. Allin Cottrell​