replace data

Dear NCL
 I have single column data set and want to replace 0(zero values) with -999.I tried to system(echo) command.
 My data name is X
      do i=0,100
          if(X(i).eq.0) then
system("echo "+"-999"+" "+">>"+"newfile.txt")
          end if
     end do
 but i have an error, how can replace zero values with -999.
_________________________________________________________________
News, entertainment and everything you care about at Live.com. Get it now!
http://www.live.com/getstarted.aspx

_______________________________________________
ncl-talk mailing list
ncl-talk_at_ucar.edu
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Sat Jul 19 2008 - 02:27:22 MDT