On Thu, 21 May 2009, yinung at Gmail wrote:
> I tested the User-defined functions and found some potential errors.
> For example, my function is:
>
> <script>
> function test (series y, int order[0:2:1], string option[null])
> if option="nc"
> printf "%s\n","empty"
> else
> printf "%s\n","no options"
> end if
> end function
> </script>
>
> the argument, string option[null], above should indicate that the
> "option" string should be optional.
>
> After normally processing it as a package, I execute this function via
> GUI (the same via command line). If I choose the default "null" as
> automatically specified by gretl, I got an error:
>
> "The symbol 'otion' is undefined... error evaluating 'if' "
I don't think there's any bug here. If the string argument to a
function may be given as null, then the function writer has to
test it before trying to use it:
function test (series y, int order[0:2:1], string option[null])
if isstring(option)
printf "option: got '%s'\n", option
else
print "no option given"
end if
end function
Allin Cottrell
