[eclipse-clp-users] exporting variables outside for

Hi,

I am trying to do something like this:
...
(for(I, 1, NN), param(NG, RHO, YMSP) do 
		length(Z, I), 
		append(Z, _, YMSP), 
		checkRho(Z, RHO, NG)),
writeln(NG)
..

for each I the NG will take different values and would like to keep the
last one but I receive the No answer.

I assume the problem is when I = 2 because NG already has a value and will
interact with the param. 

How can I solve the problem?

Best regards,
Bogdan.