loop and external file writing

[didiwidi]

I need to make an external file within a DO loop, where I change the parameters of a model. In an external file I write my parameters and statistics. In the way I do it, I also write the answers on each other, in stead of becoming a nice overview of all my results. How do I have to do this, so that every loop has a row in my external file ?

Thanks in advance!
(Fortran77)
DO
%change parameters
%RMSE
u=20
open (u, FILE='uit.txt')
write(u,33) parameters, RMSE
33 format (F6.3, F6.3, F6.3)
close (u)

continue

 

[xwb]

At a guess, something like this

character*16 filename
integer iteration

iteration = 0
DO
%change parameters
%RMSE
    u=20
    iteration = iteration + 1
    write (filename, '(A,I0,A)') 'uit', iteration, '.txt'
    open (u, FILE=filename)
        write(u,33) parameters, RMSE
33    format (F6.3, F6.3, F6.3)
    close (u)

end do