A quick follow-up with another error. As part of trying to figure out the initial error, I moved the nulldata command inside the first loop and got an error saying it's not available in loop mode. Ok, but moving 'nulldata' back to where it initially was now results in the same error (ie, gretl still thinks nulldata is inside the first loop). Closing the script & reopening doesn't help. PS ________________________________ From: gretl-users-bounces(a)lists.wfu.edu [mailto:gretl-users-bounces@lists.wfu.edu] On Behalf Of Summers, Peter Sent: Tuesday, February 02, 2010 1:25 PM To: Gretl list Subject: [Gretl-users] scalar in loop condition Hi folks, The following has me at a complete loss. This script runs fine: \begin{script} # program to perform calculations in problem 1.2 of Davidson & MacKinnon nlist = {10; 100; 1000; 10000} n = rows(nlist) means = zeros(n,2) loop i=1..n --quiet jnk1 = cauchy(nlist[i]) jnk2 = mnormal(nlist[i],1) means[i,] = {meanc(jnk1), meanc(jnk2)} endloop print means \end{script} ("Cauchy" is a function I wrote - see attached). However, when I try to run the following one, I get an error saying "undefined variable nreps in loop condition". This happens even though the script output says "generated scalar nreps = 1:" \begin{script} n = 25; # sample size nreps = 1; # number of replications beta1 = 1; beta2 = 0.8; # true values of parameters b1 = 0; b2 = 0; nulldata n loop ii=1..nreps # simulate data series y = zeros(n,1) series u = normal() #y[1] = beta1 + u[1] loop jj=2..n --quiet y[jj] = beta1 + beta2[jj-1] + u[jj] endloop series y1 = y(-1) # run regression ols y 0 y1 b1 = b1 + $coeff(1) b2 = b2 + $coeff(2) print b1 b2 endloop \end{script} I've attached both scripts. Note that I've just started on ETM_3_1, so there may well be other errors (still getting used to gretl scripts). I can't for the life of me figure out why either both work or both don't run. I'm using gretl 1.8.7 on WinXP. TIA, PS =============================== Dr. Peter Summers Assistant Professor Department of Economics Texas Tech University ===============================

On 02-02-2010, at 21:11, Berend Hasselman wrote: I should have written: y[jj] = beta1 + beta2 * y[jj-1] + u[jj] It's correct in the script. Berend

On Tue, 2 Feb 2010, Summers, Peter wrote: You can type "endloop" in the gretl console to get out of a broken loop. Allin Cottrell

Summers, Peter schrieb: This sounds as if a similar thing caused some problems for me working with user-defined functions (i.e. errors in a function...end function block led to more errors later on, often had to restart). This is just a hunch, though. -sven