On Thu, 29 Nov 2018, Stefano wrote: Good point, we might as well include the numeric codes too. That extension is now in git (not yet snapshots). Some illustrations of what can be done: <gretl> ? matrix matcodes = {248,112,004,040,422,798} Generated matrix matcodes ? strings S = isocountry(matcodes, 1) ? print S Array of strings, length 6 [1] "Åland Islands" [2] "Belarus" [3] "Afghanistan" [4] "Austria" [5] "Lebanon" [6] "Tuvalu" ? nulldata 6 --preserve periodicity: 1, maxobs: 6 observations range: 1 to 6 ? series numcodes = matcodes' Generated series numcodes (ID 2) ? strings S = isocountry(numcodes, 2) ? print S Array of strings, length 6 [1] "AX" [2] "BY" [3] "AF" [4] "AT" [5] "LB" [6] "TV" ? string numcode = isocountry("DE", 4) Generated string numcode ? eval atof(numcode) 276 </gretl> Note that if you specify output = 4 (numeric code) you actually get the result in string form, but it's easily converted via atof(). Also, re. Wurzistan, on a match failure you get an empty string and a warning is printed. Allin