[Gretl-users] Error messages from inside functions

[Allin Cottrell]

On Tue, 16 Oct 2007, andreas.rosenblad at ltv.se wrote:

> I am writing a function that, when used with some bad input variables,
> breaks with the following error message:
> 
> No observations would be left!
> >> smpl group != groupremove_k --restrict
> 
> I would prefer to have the possibility to
> 
> a) Prevent these error messages from the output and instead provide my own
> error message, e.g. funcerr "ERROR: No observations left!"
> 
> or, if this is not possible,
> 
> b) prevent the error message ">> smpl group != groupremove_k --restrict"
> from the output and only have the output "No observations would be left!".

Yes, I see there's a problem with controlling error-reporting from 
loops inside functions.  I think this is now fixed in CVS.  For 
example (silly example, but never mind):

function badfun (series x)
  loop 1
    genr rvar = (x = 0)
    if sum(rvar) = 0
      funcerr "ERROR: empty sub-sample!"
    end if
    smpl rvar --restrict 
  endloop
end function

open data4-1
badfun(price)

This now prints:

? badfun(price)
badfun: "ERROR: empty sub-sample!"

Allin Cottrell