Re: [Gretl-users] foreach vs for with list

On Fri, 15 Dec 2017, Schaff, Frederik wrote: > Hi there, I'd expect both options to be equivalent (add a matrix with the > data from the series to the array of matrices). However, the forach loop > only adds the first data-point to the matrix. > > <hansl> > open denmark.gdt -q > list ls = 1 4 > matrices M = null > loop foreach l ls > matrix temp = l > colnames(temp,varname(l)) > M+=temp > endloop > > matrices M2 = null > loop s=1..nelem(ls) > matrix temp = ls[s] > colnames(temp,varname(ls[s])) > M2 += temp > endloop In your first loop, 'l' is a just scalar index, so matrix temp = l gives you {1} on the first iteration and {2} on the second. If you want to access the series at position l in the list you need to say matrix temp = $l Then you'll get the same output as from your second loop.