NAME
          isopen - Determines whether output file is open

     SYNOPSIS
          #include "lpj.h"

          Bool isopen(const Outputfile *output,int index);


     DESCRIPTION
          Function determines whether output data file has been
          successfully opened.  The arguments of isopen are:

          output
               Pointer to initialized output data. output must be
               initialized by fopenoutput().

          index
               Index of output data file to be checked.

     RETURN VALUE
          Function returns TRUE if output for index has been opened,
          FALSE otherwise.

     AUTHORS
          Werner von Bloh (Werner.von.Bloh@pik-potsdam.de), Sibyll
          Schaphoff (Sibyll.Schaphoff@pik-potsdam.de), Stefanie Rost
          (Jachner) (Stefanie.Rost@pik-potsdam.de), Marlies
          Gumpenberger (Marlies.Gumpenberger@pik-potsdam.de), Tim
          Beringer (Erbrecht) (Tim.Beringer@pik-potsdam.de), Christoph
          Mueller (Christoph.Mueller@pik-potsdam.de) Jens Heinke
          (Jens.Heinke@pik-potsdam.de), Hester Biemans
          (Hester.Biemans@wur.nl), Kirsten Thonicke
          (Kirsten.Thonicke@pik-potsdam.de), Ursula Heyder
          (Ursula.Heyder@pik-potsdam.de),


     SEE ALSO
          fopenoutput(3), fcloseoutput(3)














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